How does sildenafil work?
Sildenafil increases blood flow by relaxing blood vessels, particularly in the penis, allowing for an erection when sexually stimulated. It also helps lower blood pressure in the lungs for people with pulmonary hypertension.
What is sildenafil used to treat?
Sildenafil is commonly prescribed for:
- Erectile dysfunction (ED) (difficulty achieving or maintaining an erection)
- Pulmonary arterial hypertension (PAH) (high blood pressure in the lungs)
Who can take sildenafil?
Sildenafil is suitable for most adults who need treatment for erectile dysfunction or pulmonary hypertension.
Who might not be able to take sildenafil?
Sildenafil may not be suitable if you:
- Have severe heart or liver problems
- Have low blood pressure or recently had a stroke or heart attack
- Take nitrate medications (such as GTN spray for angina)
- Have certain eye conditions like retinitis pigmentosa
Can I take sildenafil if I’m pregnant or breastfeeding?
Sildenafil is not usually prescribed for women, except in cases of pulmonary hypertension. If you are pregnant or breastfeeding, speak to your doctor.
What if I miss a dose?
- For erectile dysfunction: Take it only when needed, about 30-60 minutes before sexual activity.
- For pulmonary hypertension: If you miss a dose, take it as soon as you remember. If it’s nearly time for your next dose, skip the missed one—do not take two doses at once.
How effective is sildenafil?
Sildenafil is highly effective for erectile dysfunction when taken as directed, with effects lasting up to 4 hours. For pulmonary hypertension, it helps improve exercise capacity and blood flow in the lungs.
What should I do if I take too much?
Taking too much sildenafil can cause severe side effects, including:
- Severe dizziness or fainting
- Dangerously low blood pressure
- Painful or prolonged erection (priapism)
If you think you’ve taken too much, seek emergency medical help immediately.
What dose of sildenafil is usually taken?
- For erectile dysfunction: 50mg as needed, 30-60 minutes before sex (may be adjusted to 25mg or 100mg based on response)
- For pulmonary hypertension: 20mg three times daily
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What are the side effects of sildenafil?
Common side effects include:
- Headache
- Flushing (warmth and redness in the face)
- Dizziness
- Indigestion
- Blocked or runny nose
Serious side effects, such as chest pain, vision loss, or an erection lasting more than 4 hours, require urgent medical attention.
How should I take sildenafil?
Sildenafil is taken as a tablet, swallowed whole with water. Avoid taking it with heavy or fatty meals, as this can delay its effect.
When should sildenafil be taken?
- For erectile dysfunction: 30 to 60 minutes before sexual activity
- For pulmonary hypertension: Three times a day, evenly spaced
What are the brand names for sildenafil?
Sildenafil is available as a generic medicine, but some branded versions include:
- Viagra (for erectile dysfunction)
- Revatio (for pulmonary hypertension)
Final thoughts
Sildenafil is an effective medication for erectile dysfunction and pulmonary hypertension when used correctly. To get the best results, follow your doctor’s advice and take it as prescribed. If you experience side effects, speak to your doctor or pharmacist.
