Swallow the pill whole. There may be rare occurrences of priapism or painful, prolonged erections. Avoid eating a large meal or a lot of food, as this can slow down the effects of the drug. You can buy it from a store-based pharmacy or reputable online pharmacy with a prescription. Before taking tadalafil, tell your doctor and pharmacist if you are allergic to tadalafil, any other medications, or any of the ingredients in tadalafil tablets.Hi Buddy!! Need to sip some snake wine or something like that to avoid side-effect Well, find at many drugstores they sale for levitra cost US$5/pill. Viagra you can find any men’s shop in Saigon when you see the sign ” Nui Lua” store. you can google for their chain’s . headache *. upset stomach. runny nose. back pain *. upper respiratory infection. heartburn *. muscle pain. For a list of side effects reported by people taking Cialis in clinical trials, including. Cialis (branded Tadalafil) Cialis is a reliable, branded ED treatment that lasts up to 36hrs. Can be taken with food. Works in 30mins, lasts up to 36hrs. Works for 80% of men. 10mg 20mg. 4 tablets. Out of stock. 8 tablets.