Sildenafil Singapore

Medically Reviewed By: Dr Leonard Leng – MBBS, MMed (FM), GDOM, DWD
Last updated: Jan 07, 2026

Sildenafil is a prescription medication in Singapore used to treat erectile dysfunction (ED) in men. It works by increasing blood flow to the penis when sexually aroused, helping achieve and maintain an erection.

The medication belongs to a class of drugs called PDE5 inhibitors. Sildenafil blocks phosphodiesterase type 5, an enzyme that restricts blood flow, allowing the blood vessels in the penis to relax and expand during arousal.

Sildenafil's effects typically last 4 to 6 hours. This does not mean a continuous erection, but rather that achieving an erection with sexual stimulation is easier during this window.

The medication reaches peak concentration in the blood about one hour after taking it. Effects then gradually diminish as the body metabolises the drug.

Several factors influence how long sildenafil lasts for each individual:

• Age: Older men tend to metabolise it more slowly, which may prolong effects
• Metabolism and health: Liver or kidney conditions can affect how the body processes the drug
• Dose: Higher doses may extend duration
• Food consumption: Fatty meals can delay onset by up to an hour
• Other medications: Certain drugs can increase sildenafil levels in the blood

Sildenafil is typically taken 30 to 60 minutes before sexual activity. Heavy or fatty meals can delay its effects.

The standard starting dose is 50mg, though this may be adjusted by your doctor depending on effectiveness and tolerability.

Sildenafil does not cause spontaneous erections or increase libido. Sexual stimulation is still required for the medication to work.

Many men feel anxious the first time, which can affect performance regardless of the medication. Effectiveness often improves with repeated use as anxiety decreases.

Common side effects of sildenafil include headache, facial flushing, indigestion, nasal congestion, and temporary visual disturbances such as a blue tint to vision. These typically resolve within a few hours.

Seek immediate medical attention if you experience chest pain, a prolonged erection lasting more than four hours, sudden vision or hearing loss, or signs of an allergic reaction such as rash, swelling, or difficulty breathing. These are rare but serious.

Sildenafil is not suitable for everyone. It is generally not prescribed to individuals who:

• Use nitrate medications for heart conditions
• Have severe heart disease or a recent heart attack
• Have very low blood pressure
• Have been advised to avoid sexual activity for medical reasons

Your doctor will review your medical history and current medications before prescribing sildenafil. This assessment is essential for your safety, particularly if you have cardiovascular conditions or take multiple medications.

Sildenafil and tadalafil are both common ED medications, but they may differ in duration and flexibility.

Some men try both before settling on a preference. Your doctor can recommend the most suitable option based on your health profile, lifestyle, and how frequently you anticipate needing the medication.

Sildenafil is a prescription-only medication in Singapore. You cannot purchase it over the counter at pharmacies without a valid prescription from a registered doctor.

A consultation is required because sildenafil can interact with certain medications and may not be suitable for men with specific health conditions.

Sildenafil typically starts from $9 per tablet, depending on the dose and where you obtain it. Consultation fees may apply, so check with your chosen clinic beforehand.

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

ED can be an early warning sign of cardiovascular disease,diabetes, high blood pressure, or high cholesterol. Men with ED are more likely to experience heart problems in subsequent years, so a consultation offers an opportunity to assess overall health and identify treatable underlying causes.

Lifestyle factors also play a role. Smoking, excessive alcohol, obesity, and sedentary habits all contribute to ED. Addressing these alongside medication as part of a more holistic approach often produces better long-term results.

For some men, ED has psychological components such as stress, relationship difficulties, or performance anxiety. Your doctor can discuss whether counselling or other support might help.

Many men feel embarrassed raising ED with a doctor, but it is a common condition that our doctors see regularly. At ATA Medical, we have male doctors and provide a private, non-judgemental environment where you can discuss your men's health concerns openly.

You do not need to prepare anything specific. Simply mentioning that you are experiencing difficulties is enough to start the conversation.

For a more comprehensive review of your health, we also offer health screenings tailored for men.

• Anson Clinic
• Orchard Clinic
• Jurong Clinic