{"id":5490,"date":"2026-02-05T22:19:16","date_gmt":"2026-02-05T22:19:16","guid":{"rendered":"https:\/\/telyrx.com\/blog\/?p=5490"},"modified":"2026-03-25T21:47:03","modified_gmt":"2026-03-25T21:47:03","slug":"what-is-sildenafil","status":"publish","type":"post","link":"https:\/\/telyrx.com\/blog\/medications\/what-is-sildenafil\/","title":{"rendered":"What Is Sildenafil?"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\" id=\"how-it-works\">How It Works<\/h2>\n\n\n\n<p><p>Sildenafil is a phosphodiesterase type 5 (PDE-5) inhibitor.<\/p><p>During sexual arousal, your body releases nitric oxide, which triggers a chemical chain reaction to relax the smooth muscles in the penis and fill it with blood. Sildenafil protects the chemical responsible for this relaxation (cGMP) from being broken down by the enzyme PDE-5. This allows the blood vessels to stay open longer and wider, helping you get and keep an erection.<\/p><p><strong>Note:<\/strong> It does not create an erection on its own; sexual stimulation is still required.<\/p><\/p>\n\n\n\n<div class=\"quick-facts-card\">\n  <table class=\"quick-facts-table\">\n    <colgroup>\n      <col\/>\n      <col\/>\n    <\/colgroup>\n\n    <thead>\n      <tr>\n        <th colspan=\"2\">Quick Facts<\/strong><\/td>\n      <\/tr>\n    <\/thead>\n\n    <tbody>\n  <tr>\n    <td>Common Brands<\/td>\n    <td>Viagra, Revatio<\/td> \n  <\/tr>\n  <tr>\n    <td>Drug Class<\/td>\n    <td>Phosphodiesterase-5 (PDE-5) inhibitor<\/td>\n  <\/tr>\n  <tr>\n    <td>Generic Status<\/td>\n    <td>Generic version of Viagra<\/td>\n  <\/tr>\n  <tr>\n    <td>Availability<\/td>\n    <td>Prescription Only<\/td>\n  <\/tr>\n   <\/tbody>\n  <\/table>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"dosing\">Dosing<\/h2>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>Sildenafil is taken &#8220;as needed.&#8221; It is not a once-daily pill.&nbsp;The typical starting dose is&nbsp;50 mg.&nbsp;It is best taken approximately 1 hour before sexual activity. However, it can be taken anywhere from 30 minutes to 4 hours before.&nbsp;<\/p>\n\n\n\n<p>Based on effectiveness and side effects, your doctor may increase the dose to a maximum of&nbsp;100 mg.&nbsp;A&nbsp;lower starting dose of&nbsp;25 mg&nbsp;is often recommended for men aged 65 and older, or those with kidney or liver impairment, to reduce the risk of side effects.&nbsp;<\/p>\n\n\n\n<p>Do not take sildenafil more than once per 24 hours.&nbsp;<\/p>\n\n\n\n<div style=\"height:28px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p><em><strong>Note:<\/strong>&nbsp;Dosing information is educational only. Your prescribing physician will&nbsp;determine&nbsp;your specific dose based on your individual health needs. Always follow your healthcare provider\u2019s instructions for exact dosing.<\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"uses\">Uses<\/h2>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>FDA-Approved Uses<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Erectile dysfunction (ED)<\/strong>: To treat the inability to get or keep an erection sufficient for sexual performance.<\/li>\n\n\n\n<li><strong>Pulmonary arterial hypertension (PAH)<\/strong>: Sold under the brand Revatio (usually 20 mg), it is used to relax blood vessels in the lungs to lower blood pressure and improve exercise capacity.<\/li>\n<\/ul>\n\n\n\n<div style=\"height:28px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p><strong>Off-Label Uses<\/strong><\/p>\n\n\n\n<p>You may see sildenafil prescribed for uses that are not &#8220;FDA-approved.&#8221; This is a very common and legal practice called &#8220;off-label&#8221; prescribing, where a doctor uses their clinical judgment to prescribe a drug for a different (but well-researched) purpose.<\/p>\n\n\n\n<p>While primarily used for ED and PAH, healthcare providers sometimes prescribe sildenafil off-label for other conditions involving blood flow:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Raynaud\u2019s phenomenon<\/strong>: To help improve severe circulation issues in the fingers and toes caused by cold or stress.<\/li>\n\n\n\n<li><strong>High-altitude pulmonary edema (HAPE)<\/strong>: It is sometimes used by mountain climbers to prevent or treat fluid buildup in the lungs at high altitudes.<\/li>\n<\/ul>\n\n\n<div class=\"telyrx-email-cta alignfull wp-block-telyrx-email-signup\">\n\t<h2 class=\"telyrx-email-cta__heading\" data-toc-hidden=\"true\">Get Savings Updates<\/h2>\n\t<p class=\"telyrx-email-cta__description\">Join our mailing list for exclusive deals and more.<\/p>\n\t\t\t<form\n\t\t\tid=\"telyrx-email-form-1\"\n\t\t\tclass=\"telyrx-email-cta__form\"\n\t\t\tdata-portal-id=\"46401311\"\n\t\t\tdata-form-id=\"14e1d7d5-6b17-4228-b42e-c06d1a6c240b\"\n\t\t\tdata-i18n=\"{&quot;subscribe&quot;:&quot;Subscribe&quot;,&quot;success&quot;:&quot;Thanks! You&#039;re subscribed.&quot;,&quot;error&quot;:&quot;Something went wrong. Please try again.&quot;}\"\n\t\t>\n\t\t\t<div class=\"telyrx-email-cta__pill\">\n\t\t\t\t<input\n\t\t\t\t\ttype=\"email\"\n\t\t\t\t\tname=\"email\"\n\t\t\t\t\tclass=\"telyrx-email-cta__input\"\n\t\t\t\t\tplaceholder=\"Enter your email\"\n\t\t\t\t\trequired\n\t\t\t\t\tautocomplete=\"email\"\n\t\t\t\t\/>\n\t\t\t\t<button type=\"submit\" class=\"telyrx-email-cta__button\">\n\t\t\t\t\tSubscribe\t\t\t\t<\/button>\n\t\t\t<\/div>\n\t\t\t<p class=\"telyrx-email-cta__status\" aria-live=\"polite\"><\/p>\n\t\t<\/form>\n\t\t<noscript>\n\t\t\t<p class=\"telyrx-email-cta__noscript\">Please enable JavaScript to use the signup form.<\/p>\n\t\t<\/noscript>\n\t<\/div>\n\n\n\n<section class=\"telyrx-side-effects\" data-toc-title=\"Side Effects\">\n\t<h2 class=\"telyrx-side-effects__heading\">Side Effects<\/h2>\n\t<hr class=\"telyrx-side-effects__separator\">\n\t<div class=\"telyrx-side-effects__content\">\n\t\t\n\n<p>Most side effects are mild to moderate and tend to fade as the drug leaves your system (usually within 4-6 hours).\u00a0<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Common Side Effects<\/h3>\n\n\n\n<div class=\"telyrx-side-effects-chip telyrx-side-effects-chip--common\">\n\t\n\n<ul class=\"wp-block-list\">\n<li>Headache\u00a0<\/li>\n\n\n\n<li>Flushing (warmth or redness in the face\/neck)\u00a0<\/li>\n\n\n\n<li>Indigestion or upset stomach\u00a0<\/li>\n\n\n\n<li>Nasal congestion (stuffy nose)\u00a0<\/li>\n\n\n\n<li>Vision\u00a0changes, such as seeing a blue tinge to objects, difficulty telling blue from green, or sensitivity to light.\u00a0<\/li>\n\n\n\n<li>Dizziness\u00a0<\/li>\n<\/ul>\n\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Serious Side Effects<\/h3>\n\n\n\n<div class=\"telyrx-side-effects-chip telyrx-side-effects-chip--serious\">\n\t\n\n<p>Serious side effects are rare, but&nbsp;it&#8217;s&nbsp;important to know what to look for&nbsp;if they do occur.&nbsp;Stop taking sildenafil and seek emergency medical help if you experience:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Priapism:<\/strong>\u00a0An erection that\u00a0is painful or\u00a0lasts longer than 4 hours. This is a medical emergency that can cause permanent damage to the penis if not treated\u00a0immediately.\u00a0<\/li>\n\n\n\n<li><strong>Sudden\u00a0vision\u00a0loss:<\/strong>\u00a0Sudden loss of vision in one or both eyes (NAION).\u00a0<\/li>\n\n\n\n<li><strong>Sudden\u00a0hearing\u00a0loss:<\/strong>\u00a0Sudden decrease or loss of hearing, often accompanied by ringing in the ears.\u00a0<\/li>\n\n\n\n<li><strong>Severe\u00a0low\u00a0blood\u00a0pressure:<\/strong>\u00a0Dizziness, fainting, or lightheadedness.\u00a0<\/li>\n\n\n\n<li><strong>Cardiovascular\u00a0symptoms:<\/strong>\u00a0Chest pain, pressure, or severe shortness of breath during sexual activity.\u00a0<\/li>\n\n\n\n<li><strong>Allergic\u00a0reaction:<\/strong>\u00a0Hives, difficulty breathing, or swelling of the face\/throat.\u00a0<\/li>\n<\/ul>\n\n<\/div>\n\n\n\n<p class=\"has-muted-color has-text-color\" style=\"font-size:0.875rem\"><em>Call your doctor immediately if you experience any concerning or prolonged symptoms.<\/em><\/p>\n\n\t<\/div>\n<\/section>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"pharmacist-tips\">Pharmacist Tips<\/h2>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Watch Your Meal<\/h3>\n\n\n\n<p>While you can take sildenafil with food, a high-fat meal (like a cheeseburger or steak) will delay the drug&#8217;s absorption. It may take longer to work or be less effective. For the fastest results, take it on an empty stomach.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Do NOT Mix with Nitrates<\/h3>\n\n\n\n<p>NEVER combine sildenafil with nitrates (nitroglycerin, isosorbide) or recreational &#8220;poppers&#8221; (amyl nitrite). This can cause a dangerous, potentially fatal drop in blood pressure.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Stimulation is Needed<\/h3>\n\n\n\n<p>The pill does not work like a switch. You still need sexual stimulation and arousal for the medication to work.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Alcohol Caution<\/h3>\n\n\n\n<p>Heavy drinking can worsen side effects like dizziness and low blood pressure. Ironically, excessive alcohol also makes it harder to get an erection, counteracting the medication.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Be Patient<\/h3>\n\n\n\n<p>It may take a few attempts to find the right timing and dose. Don&#8217;t give up if it doesn&#8217;t work perfectly the very first time.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"drug-interactions\">Drug Interactions<\/h2>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>Sildenafil interacts with several common medications.&nbsp;<\/p>\n\n\n\n<p><strong>DO NOT TAKE SILDENAFIL<\/strong>&nbsp;if you take:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Nitrates<\/strong>\u00a0(nitroglycerin, isosorbide mononitrate\/dinitrate).\u00a0<\/li>\n\n\n\n<li><strong>Guanylate cyclase stimulators<\/strong>\u00a0(riociguat\u00a0for pulmonary hypertension).\u00a0<\/li>\n<\/ul>\n\n\n\n<p>Use caution and inform your doctor if you take:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Alpha-blockers<\/strong>\u00a0(tamsulosin\/Flomax):\u00a0Used for prostate issues. Taking these together can cause low blood pressure. Your doctor may\u00a0advise\u00a0separating the doses\u00a0by\u00a0a few hours.\u00a0<\/li>\n\n\n\n<li><strong>Blood pressure medications<\/strong>:\u00a0Sildenafil adds to the\u00a0blood-pressure-lowering effect.\u00a0<\/li>\n\n\n\n<li><strong>Protease inhibitors<\/strong>\u00a0(Ritonavir):\u00a0Used for HIV.\u00a0<\/li>\n\n\n\n<li><strong>Antifungals<\/strong>\u00a0(Ketoconazole).\u00a0<\/li>\n\n\n\n<li><strong>Grapefruit juice<\/strong>:\u00a0Can increase the levels of sildenafil in your blood, potentially worsening side effects.\u00a0<\/li>\n<\/ul>\n\n\n\n<p>Always give your doctor and pharmacist a complete list of all your medications, vitamins, and supplements to check for potential interactions.&nbsp;<\/p>\n\n\n\n<section class=\"telyrx-faq-section\" data-toc-title=\"FAQs\">\n\t<h2 class=\"telyrx-faq-heading\">FAQs<\/h2>\n\t\t<div class=\"telyrx-faq-items\">\n\t\t\n\n<details class=\"telyrx-faq-item\">\n\t<summary class=\"telyrx-faq-question\">\n\t\t<span class=\"telyrx-faq-question-text\">How long does Viagra (sildenafil) last?<\/span>\n\t\t<svg class=\"telyrx-faq-chevron\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" fill=\"none\" aria-hidden=\"true\">\n\t\t\t<path d=\"M5 7.5L10 12.5L15 7.5\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\n\t\t<\/svg>\n\t<\/summary>\n\t<div class=\"telyrx-faq-answer\">\n\t\t\n\n<p>Sildenafil typically stays active in your system for 4 to 6 hours. This does not mean you will have an erection for that long, but that you can achieve one during that window with stimulation.<\/p>\n\n\t<\/div>\n<\/details>\n\n\n\n<details class=\"telyrx-faq-item\">\n\t<summary class=\"telyrx-faq-question\">\n\t\t<span class=\"telyrx-faq-question-text\">How much sildenafil should I take for the first time?<\/span>\n\t\t<svg class=\"telyrx-faq-chevron\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" fill=\"none\" aria-hidden=\"true\">\n\t\t\t<path d=\"M5 7.5L10 12.5L15 7.5\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\n\t\t<\/svg>\n\t<\/summary>\n\t<div class=\"telyrx-faq-answer\">\n\t\t\n\n<p>The standard starting dose is usually 50 mg. However, if you are over 65 or have kidney\/liver issues, your doctor will likely start you on 25 mg. Always follow your provider&#8217;s instructions.<\/p>\n\n\t<\/div>\n<\/details>\n\n\n\n<details class=\"telyrx-faq-item\">\n\t<summary class=\"telyrx-faq-question\">\n\t\t<span class=\"telyrx-faq-question-text\">How long does it take for sildenafil to take effect?<\/span>\n\t\t<svg class=\"telyrx-faq-chevron\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" fill=\"none\" aria-hidden=\"true\">\n\t\t\t<path d=\"M5 7.5L10 12.5L15 7.5\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\n\t\t<\/svg>\n\t<\/summary>\n\t<div class=\"telyrx-faq-answer\">\n\t\t\n\n<p>It typically takes 30 to 60 minutes to start working. It works fastest if taken on an empty stomach.<\/p>\n\n\t<\/div>\n<\/details>\n\n\n\n<details class=\"telyrx-faq-item\">\n\t<summary class=\"telyrx-faq-question\">\n\t\t<span class=\"telyrx-faq-question-text\">Can I take Viagra every day?<\/span>\n\t\t<svg class=\"telyrx-faq-chevron\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" fill=\"none\" aria-hidden=\"true\">\n\t\t\t<path d=\"M5 7.5L10 12.5L15 7.5\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\n\t\t<\/svg>\n\t<\/summary>\n\t<div class=\"telyrx-faq-answer\">\n\t\t\n\n<p>Sildenafil is generally prescribed for use &#8220;as needed&#8221; before sex, not as a daily scheduled pill. If you require ED treatment daily or want more spontaneity, talk to your doctor about tadalafil (Cialis), which has a specific low-dose &#8220;once-daily&#8221; option.<\/p>\n\n\t<\/div>\n<\/details>\n\n\n\n<details class=\"telyrx-faq-item\">\n\t<summary class=\"telyrx-faq-question\">\n\t\t<span class=\"telyrx-faq-question-text\">Can women take sildenafil?<\/span>\n\t\t<svg class=\"telyrx-faq-chevron\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" fill=\"none\" aria-hidden=\"true\">\n\t\t\t<path d=\"M5 7.5L10 12.5L15 7.5\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\n\t\t<\/svg>\n\t<\/summary>\n\t<div class=\"telyrx-faq-answer\">\n\t\t\n\n<p>Sildenafil is not FDA-approved for sexual dysfunction in women. While some studies have looked into it, results are mixed. It is FDA-approved for women only for the treatment of pulmonary arterial hypertension (PAH).<\/p>\n\n\t<\/div>\n<\/details>\n\n\n\n<details class=\"telyrx-faq-item\">\n\t<summary class=\"telyrx-faq-question\">\n\t\t<span class=\"telyrx-faq-question-text\">Does sildenafil make you last longer?<\/span>\n\t\t<svg class=\"telyrx-faq-chevron\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" fill=\"none\" aria-hidden=\"true\">\n\t\t\t<path d=\"M5 7.5L10 12.5L15 7.5\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\n\t\t<\/svg>\n\t<\/summary>\n\t<div class=\"telyrx-faq-answer\">\n\t\t\n\n<p>No. Sildenafil helps you get and keep an erection. It does not treat premature ejaculation (how fast you climax) or increase your libido (sex drive).<\/p>\n\n\t<\/div>\n<\/details>\n\n\n\n<details class=\"telyrx-faq-item\">\n\t<summary class=\"telyrx-faq-question\">\n\t\t<span class=\"telyrx-faq-question-text\">What should I do if sildenafil doesn&#8217;t work?<\/span>\n\t\t<svg class=\"telyrx-faq-chevron\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" fill=\"none\" aria-hidden=\"true\">\n\t\t\t<path d=\"M5 7.5L10 12.5L15 7.5\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\n\t\t<\/svg>\n\t<\/summary>\n\t<div class=\"telyrx-faq-answer\">\n\t\t\n\n<p>Don&#8217;t panic. It is common for it not to work perfectly the first time. It may take a few attempts for your body to adjust. Ensure you waited long enough (1 hour), didn&#8217;t eat a heavy meal beforehand, and were sexually stimulated. If it still doesn&#8217;t work after several attempts, talk to your doctor about adjusting the dose or trying a different medication like tadalafil.<\/p>\n\n\t<\/div>\n<\/details>\n\n\n\n<details class=\"telyrx-faq-item\">\n\t<summary class=\"telyrx-faq-question\">\n\t\t<span class=\"telyrx-faq-question-text\">Can I cut sildenafil pills in half?<\/span>\n\t\t<svg class=\"telyrx-faq-chevron\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" fill=\"none\" aria-hidden=\"true\">\n\t\t\t<path d=\"M5 7.5L10 12.5L15 7.5\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\n\t\t<\/svg>\n\t<\/summary>\n\t<div class=\"telyrx-faq-answer\">\n\t\t\n\n<p>Generally, yes. Unlike some extended-release medications, sildenafil tablets can usually be split if they are scored (have a line down the middle). However, it is always best to use the specific strength prescribed to you. Ask your pharmacist if your specific brand of generic sildenafil is safe to split.<\/p>\n\n\t<\/div>\n<\/details>\n\n\n\n<details class=\"telyrx-faq-item\">\n\t<summary class=\"telyrx-faq-question\">\n\t\t<span class=\"telyrx-faq-question-text\">Does sildenafil expire?<\/span>\n\t\t<svg class=\"telyrx-faq-chevron\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" fill=\"none\" aria-hidden=\"true\">\n\t\t\t<path d=\"M5 7.5L10 12.5L15 7.5\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\n\t\t<\/svg>\n\t<\/summary>\n\t<div class=\"telyrx-faq-answer\">\n\t\t\n\n<p>Yes, like all medications, sildenafil has an expiration date printed on the bottle or pharmacy label. Do not take expired medication, as it may not be effective and could potentially be unsafe.<\/p>\n\n\t<\/div>\n<\/details>\n\n\n\n<details class=\"telyrx-faq-item\">\n\t<summary class=\"telyrx-faq-question\">\n\t\t<span class=\"telyrx-faq-question-text\">How does sildenafil compare to tadalafil and vardenafil?<\/span>\n\t\t<svg class=\"telyrx-faq-chevron\" width=\"20\" height=\"20\" viewBox=\"0 0 20 20\" fill=\"none\" aria-hidden=\"true\">\n\t\t\t<path d=\"M5 7.5L10 12.5L15 7.5\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\n\t\t<\/svg>\n\t<\/summary>\n\t<div class=\"telyrx-faq-answer\">\n\t\t\n\n<p>While all three are PDE-5 inhibitors used for ED, they have&nbsp;large&nbsp;differences&nbsp;in duration and food interactions:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Sildenafil (Viagra):\u00a0<\/strong>Lasts 4-6 hours. Works best on an empty stomach (high-fat meals delay it). Good for planned sexual activity.\u00a0<\/li>\n\n\n\n<li><strong>Tadalafil (Cialis):\u00a0<\/strong>Lasts up to\u00a036 hours. Can be taken with or without food. Ideal for spontaneity or &#8220;weekend&#8221; use.\u00a0<\/li>\n\n\n\n<li><strong>Vardenafil (Levitra):\u00a0<\/strong>Lasts 4-6 hours (similar to\u00a0sildenafil). It is slightly less affected by food than sildenafil and is sometimes effective for men who did not respond well to sildenafil.\u00a0<\/li>\n<\/ul>\n\n\t<\/div>\n<\/details>\n\n\t<\/div>\n<\/section>\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"How long does Viagra (sildenafil) last?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Sildenafil typically stays active in your system for 4 to 6 hours. This does not mean you will have an erection for that long, but that you can achieve one during that window with stimulation.\"}},{\"@type\":\"Question\",\"name\":\"How much sildenafil should I take for the first time?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The standard starting dose is usually 50 mg. However, if you are over 65 or have kidney\/liver issues, your doctor will likely start you on 25 mg. Always follow your provider's instructions.\"}},{\"@type\":\"Question\",\"name\":\"How long does it take for sildenafil to take effect?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It typically takes 30 to 60 minutes to start working. It works fastest if taken on an empty stomach.\"}},{\"@type\":\"Question\",\"name\":\"Can I take Viagra every day?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Sildenafil is generally prescribed for use \\\"as needed\\\" before sex, not as a daily scheduled pill. If you require ED treatment daily or want more spontaneity, talk to your doctor about tadalafil (Cialis), which has a specific low-dose \\\"once-daily\\\" option.\"}},{\"@type\":\"Question\",\"name\":\"Can women take sildenafil?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Sildenafil is not FDA-approved for sexual dysfunction in women. While some studies have looked into it, results are mixed. It is FDA-approved for women only for the treatment of pulmonary arterial hypertension (PAH).\"}},{\"@type\":\"Question\",\"name\":\"Does sildenafil make you last longer?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. Sildenafil helps you get and keep an erection. It does not treat premature ejaculation (how fast you climax) or increase your libido (sex drive).\"}},{\"@type\":\"Question\",\"name\":\"What should I do if sildenafil doesn't work?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Don't panic. It is common for it not to work perfectly the first time. It may take a few attempts for your body to adjust. Ensure you waited long enough (1 hour), didn't eat a heavy meal beforehand, and were sexually stimulated. If it still doesn't work after several attempts, talk to your doctor about adjusting the dose or trying a different medication like tadalafil.\"}},{\"@type\":\"Question\",\"name\":\"Can I cut sildenafil pills in half?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Generally, yes. Unlike some extended-release medications, sildenafil tablets can usually be split if they are scored (have a line down the middle). However, it is always best to use the specific strength prescribed to you. Ask your pharmacist if your specific brand of generic sildenafil is safe to split.\"}},{\"@type\":\"Question\",\"name\":\"Does sildenafil expire?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, like all medications, sildenafil has an expiration date printed on the bottle or pharmacy label. Do not take expired medication, as it may not be effective and could potentially be unsafe.\"}},{\"@type\":\"Question\",\"name\":\"How does sildenafil compare to tadalafil and vardenafil?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"While all three are PDE-5 inhibitors used for ED, they have&nbsp;large&nbsp;differences&nbsp;in duration and food interactions:&nbsp;\\n\\n\\nSildenafil (Viagra):\u00a0Lasts 4-6 hours. Works best on an empty stomach (high-fat meals delay it). Good for planned sexual activity.\u00a0\\n\\n\\n\\nTadalafil (Cialis):\u00a0Lasts up to\u00a036 hours. Can be taken with or without food. Ideal for spontaneity or \\\"weekend\\\" use.\u00a0\\n\\n\\n\\nVardenafil (Levitra):\u00a0Lasts 4-6 hours (similar to\u00a0sildenafil). It is slightly less affected by food than sildenafil and is sometimes effective for men who did not respond well to sildenafil.\u00a0\"}}]}<\/script>\n\n<div class=\"telyrx-comparable-medications wp-block-telyrx-comparable-medications\">\n\t<h2 class=\"telyrx-comparable-medications__title\">Comparable Medications<\/h2>\n\t\t\t<div class=\"telyrx-comparable-medications__intro\">\n\n<p><strong>Sildenafil, Tadalafil, Vardenafil, or Avanafil?<\/strong>&nbsp;<\/p>\n\n\n\n<p>Sildenafil is the original PDE-5 inhibitor, but there are alternatives.&nbsp;<\/p>\n\n<\/div>\n\t\t\t\t<div class=\"telyrx-comparable-medications__item\">\n\t\t\t<div class=\"telyrx-comparable-medications__item-top\">\n\t\t\t\t<div class=\"telyrx-comparable-medications__item-info\">\n\t\t\t\t\t<h3 class=\"telyrx-comparable-medications__name\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"telyrx-comparable-medications__name-link\" href=\"https:\/\/telyrx.com\/medications\/sildenafil\">\n\t\t\t\t\t\t\t\tSildenafil \t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t<\/h3>\n\n\t\t\t\t\t\t\t\t\t\t\t<p class=\"telyrx-comparable-medications__price\">\n\t\t\t\t\t\t\tFrom $24.99\t\t\t\t\t\t<\/p>\n\t\t\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t\t\t\t\t<a class=\"telyrx-comparable-medications__cta\" href=\"https:\/\/telyrx.com\/medications\/sildenafil\">\n\t\t\t\t\t\tView Product\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t\t\t<p class=\"telyrx-comparable-medications__description\">\n\t\t\t\t\tThe &quot;little blue pill.&quot; Works in 30-60 minutes and lasts for 4-6 hours. Best on an empty stomach.\t\t\t\t<\/p>\n\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<hr class=\"telyrx-comparable-medications__divider\">\n\t\t\t\t\t<div class=\"telyrx-comparable-medications__item\">\n\t\t\t<div class=\"telyrx-comparable-medications__item-top\">\n\t\t\t\t<div class=\"telyrx-comparable-medications__item-info\">\n\t\t\t\t\t<h3 class=\"telyrx-comparable-medications__name\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"telyrx-comparable-medications__name-link\" href=\"https:\/\/telyrx.com\/tadalafil\">\n\t\t\t\t\t\t\t\tTadalafil\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t<\/h3>\n\n\t\t\t\t\t\t\t\t\t\t\t<p class=\"telyrx-comparable-medications__price\">\n\t\t\t\t\t\t\tFrom $29.99\t\t\t\t\t\t<\/p>\n\t\t\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t\t\t\t\t<a class=\"telyrx-comparable-medications__cta\" href=\"https:\/\/telyrx.com\/tadalafil\">\n\t\t\t\t\t\tView Product\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t\t\t<p class=\"telyrx-comparable-medications__description\">\n\t\t\t\t\tThe &quot;weekend pill.&quot; Lasts up to 36 hours. It can be taken with food and has a daily dosing option.\t\t\t\t<\/p>\n\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<hr class=\"telyrx-comparable-medications__divider\">\n\t\t\t\t\t<div class=\"telyrx-comparable-medications__item\">\n\t\t\t<div class=\"telyrx-comparable-medications__item-top\">\n\t\t\t\t<div class=\"telyrx-comparable-medications__item-info\">\n\t\t\t\t\t<h3 class=\"telyrx-comparable-medications__name\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"telyrx-comparable-medications__name-link\" href=\"https:\/\/telyrx.com\/medications\/vardenafil\">\n\t\t\t\t\t\t\t\tVardenafil\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t<\/h3>\n\n\t\t\t\t\t\t\t\t\t\t\t<p class=\"telyrx-comparable-medications__price\">\n\t\t\t\t\t\t\tFrom $69.99\t\t\t\t\t\t<\/p>\n\t\t\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t\t\t\t\t<a class=\"telyrx-comparable-medications__cta\" href=\"https:\/\/telyrx.com\/medications\/vardenafil\">\n\t\t\t\t\t\tView Product\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t\t\t<p class=\"telyrx-comparable-medications__description\">\n\t\t\t\t\tSimilar duration to sildenafil (4-6 hours) but is very potent and requires smaller doses (mg for mg).\t\t\t\t<\/p>\n\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<hr class=\"telyrx-comparable-medications__divider\">\n\t\t\t\t\t<div class=\"telyrx-comparable-medications__item\">\n\t\t\t<div class=\"telyrx-comparable-medications__item-top\">\n\t\t\t\t<div class=\"telyrx-comparable-medications__item-info\">\n\t\t\t\t\t<h3 class=\"telyrx-comparable-medications__name\">\n\t\t\t\t\t\t\t\t\t\t\t\t\tAvanafil (Stendra)\t\t\t\t\t\t\t\t\t\t\t<\/h3>\n\n\t\t\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t\t\t<p class=\"telyrx-comparable-medications__description\">\n\t\t\t\t\tThe fastest-acting option, often working in as little as 15 minutes.\t\t\t\t<\/p>\n\t\t\t\t\t<\/div>\n\n\t\t\t<\/div>\n\n\n<div class=\"telyrx-product-list telyrx-product-list--single wp-block-telyrx-product-list\">\n\t\t\t\t\t<a class=\"telyrx-product-list__card telyrx-product-list__card--single\" href=\"https:\/\/telyrx.com\/medications\/sildenafil\">\n\t\t\t\t\t\t\t<img\n\t\t\t\t\tclass=\"telyrx-product-list__image\"\n\t\t\t\t\tsrc=\"https:\/\/telyrx.com\/media\/catalog\/product\/s\/i\/sildenafil_50mg-835_6.png\"\n\t\t\t\t\talt=\"Sildenafil \"\n\t\t\t\t\twidth=\"213\"\n\t\t\t\t\theight=\"213\"\n\t\t\t\t\tloading=\"lazy\"\n\t\t\t\t>\n\t\t\t\t\t\t<div class=\"telyrx-product-list__content\">\n\t\t\t\t<p class=\"telyrx-product-list__name\">Sildenafil <\/p>\n\t\t\t\t<span class=\"telyrx-product-list__cta telyrx-product-list__cta--yellow\">\n\t\t\t\t\tView Product\t\t\t\t<\/span>\n\t\t\t<\/div>\n\t\t<\/a>\n\t<\/div>\n\n\n<div class=\"telyrx-product-list-section alignfull wp-block-telyrx-product-list\">\n\t<h2 class=\"telyrx-product-list-section__heading\">We Have Sildenafil in Stock. Get Yours Today!<\/h2>\n\t<div class=\"telyrx-product-list telyrx-product-list--footer-multi\">\n\t\t<div class=\"telyrx-product-list__grid\">\n\t\t\t\t\t\t\t<a class=\"telyrx-product-list__card\" href=\"https:\/\/telyrx.com\/medications\/sildenafil\">\n\t\t\t\t\t\t\t\t\t\t\t<img\n\t\t\t\t\t\t\tclass=\"telyrx-product-list__image\"\n\t\t\t\t\t\t\tsrc=\"https:\/\/telyrx.com\/media\/catalog\/product\/s\/i\/sildenafil_50mg-835_6.png\"\n\t\t\t\t\t\t\talt=\"Sildenafil \"\n\t\t\t\t\t\t\twidth=\"213\"\n\t\t\t\t\t\t\theight=\"213\"\n\t\t\t\t\t\t\tloading=\"lazy\"\n\t\t\t\t\t\t>\n\t\t\t\t\t\t\t\t\t\t<div class=\"telyrx-product-list__content\">\n\t\t\t\t\t\t<p class=\"telyrx-product-list__name\">Sildenafil <\/p>\n\t\t\t\t\t\t<span class=\"telyrx-product-list__cta telyrx-product-list__cta--yellow\">\n\t\t\t\t\t\t\tOrder Now\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/a>\n\t\t\t\t\t<\/div>\n\t<\/div>\n\t\t\t<div class=\"telyrx-product-list-section__extra\">\n\t\t\t<p class=\"has-muted-color has-text-color has-urbanist-font-family\" style=\"font-size:0.875rem;font-style:italic;font-weight:400;line-height:1.571\"><strong>Important:<\/strong> Information on this page is for educational purposes only. Prescribing decisions are made by independent, licensed providers. TelyRx operates technology-enabled pharmacies and a telehealth platform that connects patients with board-certified licensed providers. Prescriptions, when provider-approved and issued, are filled and shipped by TelyRx-affiliated pharmacies. We do not employ physicians or make prescribing decisions. Learn more about our editorial standards <a href=\"\/blog\/editorial-standards\/\">here<\/a>.<\/p>\t\t<\/div>\n\t<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Sildenafil is one of the most widely recognized prescription medications in the world, best known by its brand name, Viagra. It is FDA-approved to treat erectile dysfunction (ED) in men. <\/p>\n<p><a href=\"https:\/\/telyrx.com\/medications\/sildenafil\">Sildenafil<\/a> is famous for being the first oral pill approved for ED. It is a &#8220;demand&#8221; medication, meaning you take it shortly before you plan to have sex, rather than every day. While typically prescribed as 25 mg, 50 mg, or 100 mg tablets for ED, it is also sold under the brand name Revatio (in 20 mg tablets) to treat pulmonary arterial hypertension (high blood pressure in the lungs).<\/p>\n","protected":false},"author":2,"featured_media":5493,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"single-medication","format":"standard","meta":{"content-type":"","telyrx_subtitle":"Uses, Side Effects, Dosage & FAQs","telyrx_last_updated":"2026-03-20T13:01","telyrx_reviewer_name":"Ashley Robinson, PharmD, Pharmacy Manager for TelyRx","telyrx_reviewer_credentials":"","telyrx_reviewer_job_title":"","telyrx_reviewer_affiliation":"","telyrx_reviewer_url":"","telyrx_show_reviewer_job_title":"","telyrx_show_reviewer_affiliation":"","telyrx_show_toc":"1","_jetpack_memberships_contains_paid_content":false,"footnotes":"","_telyrx_clean_url":"\/medications\/sildenafil\/what-is\/"},"categories":[86],"tags":[],"class_list":["post-5490","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-medications"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>What Is Sildenafil (Viagra)? Uses, Side Effects, Dosage, and FAQs<\/title>\n<meta name=\"description\" content=\"Learn what Sildenafil (Viagra) is, how it works, dosing, side effects, FAQs, and how to get it prescribed online and delivered through TelyRx.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/telyrx.com\/blog\/medications\/what-is-sildenafil\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What Is Sildenafil?\" \/>\n<meta property=\"og:description\" content=\"Learn what Sildenafil (Viagra) is, how it works, dosing, side effects, FAQs, and how to get it prescribed online and delivered through TelyRx.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/telyrx.com\/blog\/medications\/what-is-sildenafil\/\" \/>\n<meta property=\"og:site_name\" content=\"TelyRx Blog\" \/>\n<meta property=\"article:published_time\" content=\"2026-02-05T22:19:16+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-03-25T21:47:03+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/telyrx.com\/blog\/wp-content\/uploads\/2026\/02\/sildenafil_50mg-835_6.jpeg\" \/>\n\t<meta property=\"og:image:width\" content=\"900\" \/>\n\t<meta property=\"og:image:height\" content=\"900\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Mariah Powers\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Mariah Powers\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"9 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/telyrx.com\/blog\/medications\/what-is-sildenafil\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/telyrx.com\/blog\/medications\/what-is-sildenafil\/\"},\"author\":{\"name\":\"Mariah Powers\",\"@id\":\"https:\/\/telyrx.com\/blog\/#\/schema\/person\/f1042a29c24ab7dd3c5f0fff9a06746b\"},\"headline\":\"What Is Sildenafil?\",\"datePublished\":\"2026-02-05T22:19:16+00:00\",\"dateModified\":\"2026-03-20T13:01:00+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/telyrx.com\/blog\/medications\/what-is-sildenafil\/\"},\"wordCount\":1367,\"publisher\":{\"@id\":\"https:\/\/telyrx.com\/blog\/#organization\"},\"image\":{\"@id\":\"https:\/\/telyrx.com\/blog\/medications\/what-is-sildenafil\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/telyrx.com\/blog\/wp-content\/uploads\/2026\/02\/sildenafil_50mg-835_6.jpeg\",\"articleSection\":[\"Medications\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/telyrx.com\/blog\/medications\/what-is-sildenafil\/\",\"url\":\"https:\/\/telyrx.com\/blog\/medications\/what-is-sildenafil\/\",\"name\":\"What Is Sildenafil (Viagra)? 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