Comparing viagra, levitra, cialis for erectile dysfunction

First we have to know what is the risk for erectile dysfunction, mainly are smoking, alchohol, high blood glucose, and high cholesterol level.

Now we go into medicine for treatment
Viagra or sildenafil is effective from 30 minutes - 4 hours and it is taken on empty stomach. Initial dose is 50mg and if well tolerated, it can increased to 100mg. If u r taking any of the so called CYP34A inhibitor like erythromycin, itraconazole, ketoconazole, saquinavir: u should start on 25 mg.
It can lower blood pressure about 8mmHg, those with heart problem is advised not to take any. About 3% men will experience blue tinge in vision after taking.

Levitra or vardenafil effectiveness is same as viagra and taken b4 food. Recommended dose is 10mg for most men, if > 65 years old start with 5mg. It may work better in diabetes related sexual dysfunction.

Cialis or tadalafil is effective within 16 minutes until 36 hours and can be taken after food.
Recommended dose of cialis is also 10mg for most men, if > 65 years old start with 5mg.

Ask the pharmacist
All the medicines here are contraindicated in patients taking nitrates of any form, regularly or intermittently. Men who have had a heart attack, stroke, or life-threatening irregular heart beats (called arrhythmia) within the last six months Men with untreated low or high blood pressure Men with retinitis pigmentosa, a progressive eye disorder that can lead to blindness are also contraindicated.

Consult your doctor b4 taking.