Cialis refers to tadalafil tablets and Viagra refers to sildenafil citrate tablets, both are male erectile dysfunction medications and there is no saying which one is better to buy. Both tadalafil tablets and sildenafil citrate tablets are oral phosphodiesterase type 5 (PDE5) inhibitors. The main features of tadalafil tablets are that they are slow acting, have a long duration of action, and are not affected by alcohol. Sildenafil citrate tablets, on the other hand, are fast-acting and do not have as long a duration of action as tadalafil tablets, but both have a range of indications that include men with erectile dysfunction. Both drugs may cause adverse reactions such as headache, flushing, gastric upset and nasal congestion, but sildenafil citrate tablets may cause a higher probability of visual abnormalities. Both are prohibited for use in people who are allergic to any of the ingredients in them, patients who are taking any form of nitrates, guanylate cyclase stimulators, women, children and other people. It should be noted that the occurrence of an abnormal erection for more than 4 hours after taking the above drugs should be urgently consulted. Tadalafil tablets and sildenafil citrate tablets can both treat erectile dysfunction in men, patients should choose the appropriate medication according to the specific condition, do not take it on their own, if there is an adverse reaction during the use of medication and can not be relieved, you should go to the hospital in a timely manner, so as not to delay the condition.