This type of medication has been through extensive trials and has been available on prescription for decades. But even these mild side effects are rare. You can take Viagra once daily, though it is not recommended to take it more often than this. They are all approved for treatment of erectile dysfunction. If you need to get an erection at least twice a week, Cialis daily tablets of 2. What to Know Before Taking Cialis If, after taking Cialis, Tadalafil, or any other ED drug, you find yourself with a painful erection for 4 hours or more, seek urgent medical advice. The advice above should give you a good idea of what Cialis dosage is right for you.The U.S. Food and Drug Administration on Friday approved the third pill to treat erectile dysfunction (ED), giving men and their doctors yet another option. The . When taken as needed, sometimes called the “weekend pill,” Cialis can start working in as little as 30 minutes for men who take the highest dose of the drug (20 .  · Cialis (Tadalafil) An alternative to Viagra that you might know is Cialis. It’s sometimes known as the “weekend pill”, because it works slightly differently to .