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Sildenafil - Overview
Sildenafil is a medication used in the treatment of men suffering from erectile dysfunction. People who might need a sildenafil prescription can use Push Health to connect with a medical provider who can prescribe the medication to a nearby or delivery pharmacy when appropriate to do so.
What Is Sildenafil?
Sildenafil, marketed under brand names such as Revatio and Viagra, belongs to a class of medications known as phosphodiesterase-5 (PDE5) inhibitors. Similar to avanafil (Stendra), tadalafil (Cialis), and vardenafil (Levitra), sildenafil is used for treating erectile dysfunction in men, sildenafil is thought to work by improving the effect of a molecule known as nitric oxide (NO) in the penis during arousal. Sildenafil medication does this by inhibiting an enzyme known as phosphodiesterase type 5. By helping to sustain nitric oxide levels in the penis during arousal, sildenafil helps improve blood flow to tissues in the penis which helps with maintaining an erection.
Sildenafil - Dosage and Cost
Sildenafil prescription tablets are frequently prescribed as sildenafil 50 mg taken between 30 and 240 minutes before sexual activity. The sildenafil dosage may be lowered to sildenafil 20 mg or increased to sildenafil 100 mg depending on the health needs of the patient and the judgement of the prescribing medical provider. Sildenafil should not be taken more than once in a 24 hour period.
Generic sildenafil tablets are considered affordable, generally costing under 50 cents per sildenafil 20 mg tablet at many pharmacies in the United States. Additionally, sildenafil coupons are sometimes available online or through the manufacturer. Occasionally, one's insurance plan will also contribute to covering the costs associated with getting sildenafil citrate prescription medication while buying sildenafil tablets at the pharmacy.
Can I Buy Sildenafil Online?
Sildenafil requires a prescription to be dispensed in the United States. Push Health can connect people who need a sildenafil prescription with a medical provider who can prescribe the medication to a retail or delivery pharmacy when appropriate to do so.
Frequently Asked Questions about Sildenafil
Is sildenafil the same as Viagra?
Yes. Viagra is the brand name for sildenafil for erectile dysfunction. Generic sildenafil is bioequivalent to Viagra - same active ingredient, same doses, same clinical effect. Generic sildenafil has been available since 2017 and is significantly more affordable than branded Viagra.
How long does sildenafil take to work?
Sildenafil typically begins working within 30 to 60 minutes of taking a dose. For fastest onset, take it on an empty or light-meal stomach - a high-fat meal can delay the onset by up to an hour and reduce peak effectiveness.
How long does sildenafil last?
Sildenafil's effects typically last 4 to 6 hours. For a longer duration option - up to 36 hours - tadalafil (Cialis) may be preferred. Tadalafil also offers a once-daily low-dose option that provides continuous efficacy.
What is the difference between sildenafil 20 mg and sildenafil 50 mg?
Sildenafil 20 mg is the dose used for pulmonary arterial hypertension (sold as Revatio), taken three times daily. It is not a standard ED dose. Sildenafil 25 mg, 50 mg, and 100 mg are the doses used for erectile dysfunction - the typical starting dose is 50 mg. Patients sometimes encounter 20 mg tablets dispensed off-label for ED at lower cost; a provider can advise on whether this approach is appropriate.
Can I take sildenafil with blood pressure medication?
It depends on the medication and the patient's specific situation. Sildenafil can cause additive blood pressure lowering when combined with antihypertensive drugs - particularly alpha-blockers. Most men on standard blood pressure medications (ACE inhibitors, ARBs, beta blockers, calcium channel blockers) can use sildenafil safely with provider oversight. Sildenafil is absolutely contraindicated with all nitrate medications. Always inform your provider of all current medications before starting sildenafil.
Is sildenafil a controlled substance?
No. Sildenafil is not a DEA-scheduled controlled substance. It is a prescription-only medication but can be legally prescribed through a telehealth consultation when clinically appropriate.
Can I take sildenafil every day?
Sildenafil can be taken as needed - up to once per day - but it is not typically taken on a fixed daily schedule for ED in the way that low-dose tadalafil is. Some patients and providers use daily sildenafil 25–50 mg in specific clinical contexts, but this is less common than the as-needed approach. For a true daily ED medication with continuous efficacy, daily tadalafil 2.5 mg or 5 mg is the FDA-approved option.
How much does sildenafil cost?
Generic sildenafil is very affordable - typically under $1 per 50 mg tablet and under $2 per 100 mg tablet at most pharmacies. A prescription savings card can reduce costs further. Branded Viagra is significantly more expensive but clinically identical to generic sildenafil.
Sildenafil - Side Effects
Prior to using sildenafil, it is important to discuss concerns and possible side effects with a medical provider and pharmacist. Side effects that may occur include back pain, headache, flushing, vision changes, dizziness, nausea and a rash. Sildenafil should be used carefully in people taking other medications for blood pressure and should not be used in conjunction with nitrate medications. Prolonged erection can occur and may necessitate urgent medical care. People with a known hypersensitivity to the medication or similar drugs should avoid using the medication.
How to Get Sildenafil with Push Health
- Complete a brief health intake. Answer some questions about your symptoms, current medications (especially any nitrates or blood pressure medications), cardiovascular history, and whether you've tried a similar medication before.
- Connect with a provider. A medical provider will review your information and evaluate whether sildenafil or another medication is appropriate. Same-day consultations are available.
- Receive your prescription. Your medical provider will send a prescription to a pharmacy of your choice - no office visit required.
- Pick up your medication. Generic sildenafil is available at most retail and delivery pharmacies and typically costs under $1 per tablet. Follow up with your medical provider if you have additional concerns.
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Last updated September 9, 2026. Given the evolving nature of medicine and science, this information might not be accurate and should not be construed as medical advice or diagnosis / treatment recommendations. Please consult a licensed medical provider if you have additional questions. Please call 911 immediately or go to the nearest emergency room if you believe you are experiencing a medical emergency.