Sildenafil (generic Viagra): dose, timing and price
Sildenafil citrate is the active ingredient in Viagra. The Viagra label says most men take 50 mg about 1 hour before sex, anywhere from 30 minutes to 4 hours before, once a day at most. Mendoxa's compounded tablet combines sildenafil with tadalafil and apomorphine, from $129 a month if prescribed.
Start your ED visit From $129/month. If prescribed · Cancel anytime · Available in 49 states (not California).
What the Viagra label says
| Label item | What it says |
|---|---|
| Usual dose | 50 mg, as needed, about 1 hour before sexual activity |
| Dosing window | 30 minutes to 4 hours before sexual activity |
| Range | May increase to a maximum of 100 mg or decrease to 25 mg |
| Frequency | Maximum once per day |
| Peak level | 30 to 120 minutes after a dose (median 60), fasted |
| High-fat meal | Delays the peak by about 60 minutes on average |
| Half-life | About 4 hours |
| Tablets | Blue, film-coated, rounded-diamond; 25, 50 or 100 mg |
Sexual stimulation is still needed. The label describes sildenafil as enhancing the nitric oxide signal released during sexual stimulation.
Who should not take sildenafil
The Viagra and Cialis labels list the same hard stops. Do not use them with organic nitrates in any form, or with a guanylate cyclase stimulator such as riociguat. Do not use them if sex is inadvisable because of your heart. Get emergency care for an erection that lasts more than 4 hours. Stop and get care for a sudden loss of vision in one or both eyes, or a sudden decrease or loss of hearing.
The label says to start at 25 mg with alpha blockers, and not to exceed 25 mg in 48 hours with ritonavir. Viagra is not indicated for women.
Mendoxa ED plans and prices
The Mendoxa ED tablet is a compounded rapid-dissolve tablet with sildenafil (the active ingredient in Viagra), tadalafil (the active ingredient in Cialis) and apomorphine. It dissolves under the tongue. The Mendoxa ED page lists a maximum of 1 dose per 24 hours. A licensed clinician decides if it fits you and selects the strength. Compounded medicines are not FDA-approved.
| Plan | 1-month plan | Per tablet | 3-month plan | Per tablet (3 months) |
|---|---|---|---|---|
| 6 tablets / month | $129 | $21.50 | $329 | $18.28 |
| 10 tablets / month | $149 | $14.90 | $379 | $12.63 |
| 20 tablets / month | $179 | $8.95 | $449 | $7.48 |
If prescribed · Cancel anytime · Available in 49 states (not California). Prices from the Mendoxa intake at try.mendoxa.co/f/ed on Oct 17, 2026. The intake always shows the current price.
Sildenafil side effects
Most common side effects (2% or more) on the Viagra label: headache, flushing, dyspepsia, abnormal vision, nasal congestion, back pain, myalgia, nausea, dizziness and rash. On the Cialis label: headache, dyspepsia, back pain, myalgia, nasal congestion, flushing and pain in limb.
Abnormal vision on the label is mostly a temporary color tinge, light sensitivity or blurred vision. In one label study, Viagra 50 mg did not add to the blood-pressure drop from alcohol at 0.5 g/kg (mean peak blood alcohol 0.08%) in healthy volunteers.
Generic Viagra, brand Viagra and a compounded tablet
Brand Viagra and generic sildenafil are FDA-approved tablets with the same active ingredient. The Mendoxa tablet is compounded: sildenafil plus tadalafil and apomorphine in one rapid-dissolve tablet. It is not FDA-approved, and it is not two brand pills taken together. See sildenafil and tadalafil in one tablet and Viagra cost.
FAQ
What is sildenafil?
Sildenafil citrate is a PDE5 inhibitor and the active ingredient in Viagra. It is prescribed for erectile dysfunction.
How long before sex should I take sildenafil?
The Viagra label says about 1 hour before, and anywhere from 30 minutes to 4 hours before. A high-fat meal can delay it.
What is the usual sildenafil dose?
The label starting dose is 50 mg, with a range of 25 mg to 100 mg, no more than once a day. The clinician decides.
Can I drink alcohol with sildenafil?
In one label study, Viagra 50 mg did not add to the blood-pressure drop from alcohol at 0.5 g/kg in healthy volunteers. Larger amounts were not tested that way. Ask the clinician.
How much does sildenafil cost with Mendoxa?
Mendoxa's compounded tablet with sildenafil, tadalafil and apomorphine is $129 for 1 month, or about $7.48 per tablet on the 3-month plan with 20 tablets per month (60 tablets total).
Start your ED visit: plans and prices
The Mendoxa ED tablet is a compounded rapid-dissolve tablet with sildenafil (the active ingredient in Viagra), tadalafil (the active ingredient in Cialis) and apomorphine. It dissolves under the tongue. The Mendoxa ED page lists a maximum of 1 dose per 24 hours. A licensed clinician decides if it fits you and selects the strength. Compounded medicines are not FDA-approved.
| Plan | 1-month plan | Per tablet | 3-month plan | Per tablet (3 months) |
|---|---|---|---|---|
| 6 tablets / month | $129 | $21.50 | $329 | $18.28 |
| 10 tablets / month | $149 | $14.90 | $379 | $12.63 |
| 20 tablets / month | $179 | $8.95 | $449 | $7.48 |
If prescribed · Cancel anytime · Available in 49 states (not California). Prices from the Mendoxa intake at try.mendoxa.co/f/ed on Oct 17, 2026. The intake always shows the current price.
References
- DailyMed: VIAGRA (sildenafil citrate) tablet, film coated, label revised 12/2017. Accessed Oct 17, 2026.
- FDA (Drugs@FDA): VIAGRA prescribing information, NDA 020895. Accessed Oct 17, 2026.
- DailyMed: CIALIS (tadalafil) tablet, film coated, label revised 3/2026. Accessed Oct 17, 2026.
- FDA: Compounding and the FDA, questions and answers. Accessed Oct 17, 2026.
- Mendoxa ED care (product, format, max 1 dose per 24 hours). Accessed Oct 17, 2026.
- Mendoxa ED intake: plan prices (term_options). Accessed Oct 17, 2026.
About Mendoxa
Mendoxa (mendoxa.co) is a US telehealth brand. Licensed clinicians in the LocumTele network review each online visit, and prescriptions are filled by Rush Pharmacy, a licensed US pharmacy. Available in 49 states (not California).
- A licensed clinician reviews every visit and can say no. A prescription is not automatic.
- A compounded medicine is not an FDA-approved finished product.
- Plans: 1 month or 3 months, from $129. If prescribed · Cancel anytime · Available in 49 states (not California).
Compounded medication prescribed only if a licensed U.S. clinician decides it is appropriate. Not FDA-approved as a finished product. Not available in California. This site is not for emergencies. Call 911 if you need urgent care.