Sildenafil (Viagra) Dosage Guide in Pakistan

Correct dose and timing of Sildenafil are essential for effective and safe use. This guide provides complete information on ED and PAH dosing, timing, food interactions, missed dose, and overdose.

Compiled by the PakVita Editorial Team · AI-assisted drafting with editorial review · Sourced from DRAP, WHO, BNF · Last updated: 2026-06-17

Dosage Guide

Quick Answer

Sildenafil (Viagra) for Erectile Dysfunction: typically 50mg taken 30-60 minutes before sexual activity, not more than once in 24 hours. Dose range is 25mg-100mg as prescribed by doctor. NEVER use with nitrates (heart medicines) — can cause fatal blood pressure drop. Take on an empty stomach or after a light meal for best effect. Requires sexual stimulation to work.

Dose at a Glance

Adult Dose

ED: typically 50mg (range 25-100mg) as prescribed. PAH (Revatio): 20mg three times daily — strictly specialist prescribed.

ED: as needed, not more than once daily. PAH: three times daily.

Max: ED: 100mg per day maximum — one dose per 24 hours. NEVER with nitrates.

Child Dose (Adult men only (for ED indication))

NOT for children — PAH pediatric dosing is strictly specialist only

N/A for routine use

Missed Dose

ED: Sildenafil is used on an as-needed basis — no regular schedule. For PAH, if a dose is missed, take it as soon as remembered. Never take a double dose.

Overdose

Sildenafil overdose can cause severe hypotension, priapism, and vision disturbances. If overdose is suspected, go to a doctor or emergency room immediately. Combined overdose with nitrates is especially dangerous — it can be fatal.

Sildenafil (Viagra) Dosage (Kitni leni hai)

Sildenafil correct dose and timing are essential for the effectiveness of ED treatment. Always follow your doctor's prescription.

Adult Dose — Erectile Dysfunction (ED)

Typical dose: 50mg
Timing: 30-60 minutes before sexual activity
Dose range: 25mg-100mg (doctor adjusts based on response)
Frequency: Not more than once in 24 hours (as needed — not on regular daily schedule)

Starting Dose: 50mg (25mg if elderly 65+, or mild hepatic/renal impairment)

Max Dose: 100mg per day — ONE dose per 24 hours maximum

Adult Dose — Pulmonary Arterial Hypertension (PAH)

20mg three times daily (Revatio formulation — specialist prescribed only)
This is completely different from ED dosing — take only under specialist direction

How to Take (Kaise leni hai)

Take with water
On an empty stomach or with a light meal (fastest onset)
Avoid heavy fatty meals 2-3 hours before
Limit alcohol
Sexual stimulation is necessary — sildenafil does not work without stimulation

Best Time to Take (Kab lena chahiye)

30-60 minutes before planned sexual activity
On an empty stomach or after a light non-fatty meal

With Food or Empty Stomach (Khali pait ya khane ke baad)

On an empty stomach or with a light meal, fastest onset is 30-60 minutes. Heavy fatty food (biryani, fried food) can delay absorption — effect comes in 1-2 hours. Avoid a large meal before taking sildenafil.

Missed Dose (Dose chhoot jaye to kya karein)

ED: This is an as-needed medicine — no regular schedule. PAH: take as soon as remembered, never take a double dose.

Overdose (Zyada Dose)

Severe hypotension, priapism, and vision changes can occur. Go to the emergency room immediately. Overdose with concurrent nitrate use can be especially fatal.

Dose Summary Table

Indication	Dose	Frequency	Notes
Erectile Dysfunction	25-100mg (start 50mg)	Max once daily, as needed	30-60 min before activity
PAH (Revatio)	20mg	Three times daily	Specialist only — different from ED dose
Elderly (65+)	Start 25mg	As above	Adjust based on response

The information in this guide is for educational purposes only. Always confirm the dose with your doctor or pharmacist.

Frequently Asked Questions

Sildenafil ki standard dose kya hai?

The typical starting dose for ED is 50mg — taken 30-60 minutes before sexual activity. The doctor can adjust to 25mg or 100mg based on response and tolerability. Maximum once daily. Confirm the exact dose with your doctor.

Sildenafil kab leni chahiye?

30-60 minutes before sexual activity. Taking it on an empty stomach or after a light meal gives the fastest effect. A heavy fatty meal can delay the effect (1-2 hours).

Kya sildenafil roz le sakte hain?

Maximum once in 24 hours. Whether regular daily use is appropriate depends on doctor's advice — the underlying cause of ED should also be addressed.

Alcohol ke sath sildenafil le sakte hain?

Avoid or limit alcohol — both are vasodilators, combined use can cause excessive BP drop, increasing the risk of dizziness and fainting.

Sildenafil aur blood pressure medicine sath le sakte hain?

Use with caution with alpha-blockers — risk of orthostatic hypotension. Nitrates are an ABSOLUTE CONTRAINDICATION. Always consult your doctor before taking sildenafil with any BP medicine.

Brand alternatives, same-class options, and other medicines used for the same conditions as Sildenafil Tablet (Viagra).

Used for the same conditions

Other medicines commonly used for headache and overlapping conditions.

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Sources

DRAP Registered Products Database — Drug Regulatory Authority of Pakistan
WHO Model List of Essential Medicines, 23rd ed. (2023) — World Health Organization
British National Formulary (BNF) — BMJ Group & Pharmaceutical Press

Medical disclaimer

This page is for educational use only and does not replace professional medical advice. Always confirm diagnosis, dose, and interactions with a qualified doctor or pharmacist before starting or changing any medicine.