Hi & Welcome.
I can understand your concern.
Both Cialis (
tadalafil) & Viagra (
sildenafil) are oral medications which act by relaxing the blood vessels which supply blood to the penis so that more blood can get there when aroused producing erection satisfactory for
sexual activity.
The most common side effects of these medications include headache,
flushing, stuffy or runny nose,
stomach upset, changes in vision &
priapism (an erection that won’t go away).
Alcohol, however, may reduce the effects of both.
To be more effective, Viagra has to be taken on an empty stomach and its action lasts only for 4-6 hours.
Whereas Cialis is not affected much by food, so can be taken after a meal.
It begins working within 15 to 30 minutes after it is taken and its effects can last 24 to 36 hours after taking it.
Its less like to cause changes in vision & flushing.
Remember these medicines are not aphrodisiacs, so you will need to be sexually stimulated by your female partner in order to get an erection.
Hope these answer your query.