We strive to use primary sources and refrain from using tertiary references. Limit your alcohol consumption. Taking tadalafil Cialis with alcohol may increase your risk of developing side effects, including reduced blood pressure. Is 20mg of Cialis better than mg of Viagra? There is also the option to take Cialis as needed. It works best when taken one hour before sex. · Maximum dose: 20 mg orally three times a day. Injection: Initial dose: or 10 mg IV bolus three times a day. Comments: No greater efficacy was achieved with oral doses higher than the maximum recommended dose. A 10 mg injection dose is predicted to provide pharmacological effect equivalent to the 20 mg oral dose. While the lower doses of mg and 5mg can be taken daily, the 10mg and 20mg doses are to be taken when needed.” Dr Zenon Andreou. Cialis is a treatment for erectile dysfunction in men. It comes in 4 different doses which are taken in different ways and under different circumstances. Cialis (tadalafil) is a type of PDE5 inhibitor that the Food and Drug Administration approved in Like other PDE5 inhibitors, it increases blood flow to the penis. There are two different ways to take Cialis: as needed or daily. If you take the pill daily, the medication stays in your system constantly. This makes it easier to get an.