Cialis' active ingredient is tadalafil, and Viagra's active ingredient is sildenafil. Both of these drugs are used to treat erectile dysfunction (ED). They are both phosphodiesterase type 5 (PDE5) inhibitors, which means they increase blood flow to the penis. However, they work in slightly different ways when it comes to when they start working and how long they last. When it comes to effects that last longer—up to 36 hours—tadalafil is known as "the weekend pill." Compared to sildenafil, which usually only works for 4 to 6 hours, this longer window of time gives you more options for when to have sexual action.
As far as strength goes, both drugs work just as well to treat ED when taken in the right amount. But different people may react differently to different medications, so it's important to talk to a doctor to find out which drug may be best for you based on your medical background, tastes, and way of life.
As far as strength goes, both drugs work just as well to treat ED when taken in the right amount. But different people may react differently to different medications, so it's important to talk to a doctor to find out which drug may be best for you based on your medical background, tastes, and way of life.