Viagra (Sildenafil)
Prescription Refill in Bangkok

Viagra Erectile Dysfunction Medication

Viagra is the original branded form of sildenafil, the medication used to treat erectile dysfunction (ED). At HealthDeliver Clinic, patients can consult a doctor about Viagra and, where appropriate, refill their prescription in Bangkok with proper medical assessment.

Who this refill service is for

This service is for patients seeking treatment for erectile dysfunction who want a proper medical assessment before using sildenafil. A doctor consultation is required — erectile dysfunction can sometimes be a sign of an underlying health condition (such as cardiovascular disease or diabetes), and sildenafil is not safe for everyone, particularly those taking certain heart medications. We assess suitability before dispensing.

What is Viagra?

Viagra is the original brand of sildenafil, first developed by Pfizer, and is one of the most well-known treatments for erectile dysfunction. It belongs to a class of medications called PDE5 inhibitors, which increase blood flow to the penis to help achieve and maintain an erection in response to sexual stimulation. The same active ingredient, sildenafil, is also available in more affordable brands such as Sidegra in Thailand.

How it works

Sildenafil relaxes the blood vessels and increases blood flow to the penis during sexual arousal. It does not cause an erection on its own — sexual stimulation is still needed. Viagra is typically taken around 30–60 minutes before sexual activity, and its effect lasts for approximately 4–6 hours.

How it’s taken

Viagra is usually taken about one hour before sexual activity, as directed by your doctor. It should not be taken more than once in a 24-hour period. Avoid taking it with large or high-fat meals, which can delay its effect. Always follow your doctor’s guidance on dose and timing.

Possible side effects

Common: headache, facial flushing, indigestion, nasal congestion, dizziness.
Less common but serious: prolonged or painful erection (priapism), sudden vision or hearing changes, chest pain. Seek medical help immediately if these occur.

Precautions

Sildenafil must not be taken with nitrate medications (used for heart conditions), as the combination can cause a dangerous drop in blood pressure. Tell your doctor about any heart problems, blood pressure issues, or other medications you take. Because erectile dysfunction can be linked to underlying health conditions, a medical assessment is important — not just to prescribe safely, but to check your overall health.