Sildenafil (Viagra) for ED in Singapore

What is Sildenafil?

Sildenafil is a tablet taken before sex to help with erectile dysfunction. It belongs to a class of medicines called PDE5 inhibitors, which improve blood flow to the penis by relaxing the smooth muscle in blood vessels. You may know it better as Viagra — that's the original brand name from Pfizer; sildenafil is the generic, which works the same way at the same doses but costs far less.

It was the first oral ED medication approved (US FDA, 1998) and is now one of the most studied medicines in the world. In Singapore it's a prescription-only medicine in 25 mg, 50 mg and 100 mg tablets — you'll need a consultation first so your doctor can check it's safe for you.

One thing to note: sildenafil is also prescribed at a different dose (20 mg three times daily, under the brand name Revatio) for pulmonary arterial hypertension. If you're already on it for that, don't take additional sildenafil for ED without your doctor's advice.

Is Sildenafil Right for Me?

Sildenafil works for most adult men with erectile dysfunction, especially when the underlying causes (diabetes, heart disease, low testosterone, stress) have been looked at and addressed. It's an on-demand medication — taken when needed, not every day — and not a cure for ED itself.

When sildenafil is NOT suitable

There are some situations where sildenafil can cause serious harm. Don't take it if you're in any of these categories:

• On nitrate medication for heart disease (e.g. glyceryl trinitrate) — the combination can cause a dangerous drop in blood pressure
• On riociguat or similar guanylate cyclase stimulators (used for pulmonary hypertension) — same risk of severe low blood pressure
• Had a heart attack, stroke, or life-threatening heart rhythm problem in the last 6 months, or you have severe heart failure or unstable angina
• Blood pressure is very low (below 90/50 mmHg) or very high and uncontrolled (above 170/110 mmHg)
• Previous non-arteritic ischaemic optic neuropathy (NAION) — a rare eye condition affecting the optic nerve
• You have a known allergy to sildenafil

When it needs careful discussion

Sildenafil can still be used in these situations, but your doctor will need to adjust the dose, watch for interactions, or consider alternatives:

• You take alpha-blockers (for prostate enlargement or blood pressure) — timing and dose may need adjustment
• You have liver or kidney disease — dose adjustment may be required
• You take medications that change how sildenafil is processed — some antifungals, HIV medications, or certain antibiotics
• You have Peyronie's disease, significant penile curvature, or cavernosal fibrosis — higher risk of priapism
• You have retinitis pigmentosa — a rare inherited eye condition (use is generally not recommended)
• Your heart condition makes sexual activity itself a concern

This is exactly what the consultation is for — to check all of this, review your current medications, and set realistic expectations before you start. Don't skip this step, even if you've bought sildenafil online before.

Side Effects

Sildenafil is generally well-tolerated at standard doses. Most side effects are mild and pass within a few hours. A small number are serious and need urgent attention.

Common (usually mild, pass within hours)

• Headache
• Facial flushing
• Indigestion or heartburn
• Nasal congestion or runny nose
• Dizziness
• Back or muscle aches
• Temporary visual changes — a bluish tint to vision, or increased sensitivity to light

Seek urgent medical help for:

• Chest pain during or after sex
• An erection lasting more than 4 hours (priapism) — this is an emergency and can cause permanent damage if left untreated
• Sudden vision loss in one or both eyes
• Sudden hearing loss, with or without ringing
• Severe allergic reaction — rash, swelling, difficulty breathing

A few things worth knowing: sildenafil isn't a controlled substance in Singapore but stays prescription-only because of interactions. Many men use it safely for years with periodic review. It doesn't treat the underlying cause of ED, so if your overall health drifts (diabetes, heart disease, testosterone), effectiveness may too.

If side effects are bothering you, don't just tough it out — a lower dose or a different PDE5 inhibitor might suit you better. And don't take more than prescribed. Higher doses don't give a bigger effect; they just give more side effects.

What Is the Price of Sildenafil in Singapore?

Sildenafil typically starts from $9 per tablet, depending on the dose prescribed and where you obtain it. Consultation fees apply separately — for the full list of ED consultation pricing, see the Erectile Dysfunction pricing table.

Sildenafil is not covered by Medisave, and most private insurance plans in Singapore exclude ED medications. If you have comprehensive medical coverage, check with your insurer to confirm whether sildenafil is reimbursable under your plan.

Last updated: Apr 30, 2026. Pricing is provided as a guide; please WhatsApp 8893 3757 to confirm current rates.