Megalis 20: price, uses & cheaper substitutes

Take it about 30 minutes before sexual activity. Unlike sildenafil it stays active for up to 36 hours, which is why it is nicknamed the "weekend pill". It still needs sexual stimulation to work – it does not cause an erection on its own.

No. The 20 mg tablet is an as-needed dose and must not be taken more than once in 24 hours. If you want daily treatment, your doctor can prescribe a much smaller daily dose of tadalafil instead. Do not increase the dose yourself.

One or two drinks are usually fine, but more than that can combine with tadalafil to lower blood pressure, causing dizziness, headache and fainting. Heavy drinking also worsens erectile dysfunction, so it defeats the purpose.

Both are PDE5 inhibitors and work similarly. Sildenafil (Viagra, Manforce) acts faster but lasts 4 to 6 hours and is affected by food; tadalafil takes a little longer but lasts up to 36 hours and can be taken with meals. Your doctor will pick based on your health, other medicines and how you want to use it. Never take both together.