About sildenafil citrate sildenafil
Phosphodiesterase type 5 inhibitor
Used for
- Erectile dysfunction
- Pulmonary arterial hypertension (specialist treatment)
Usual adult dose
Erectile dysfunction: usually 50 mg about one hour before sex; adjust to 25–100 mg, no more than once daily. Pulmonary hypertension dosing is specialist-directed.
Common side effects
- Headache
- Facial flushing
- Indigestion
- Nasal congestion
Important warnings
- Never combine with nitrate medicines or riociguat; blood pressure may fall dangerously.
- Seek urgent care for chest pain, sudden vision or hearing loss, or an erection lasting over four hours.
- Use caution with heart disease, low blood pressure, or medicines that lower blood pressure.
- Do not take more than once daily for erectile dysfunction.
Pregnancy
Not used to treat erectile dysfunction in pregnancy; pulmonary hypertension use requires specialist assessment.
Breastfeeding
Not generally used during breastfeeding; specialist advice is needed if prescribed for pulmonary hypertension.
Interactions
- Nitrates, including nitroglycerin, can cause a dangerous blood-pressure drop.
- Riociguat must not be combined with sildenafil.
- Some antibiotics, antifungals, and HIV medicines can increase sildenafil levels.
- Alpha-blockers and other blood-pressure medicines may increase dizziness or fainting.
AI-generated from general medical knowledge, not from this product's official leaflet. It may be incomplete or out of date. Not medical advice — ask a pharmacist or doctor before making any decision.