You should only be treated with one of these products at a time. If you are taking tadalafil for erectile dysfunction, your doctor will probably start you on an average dose of tadalafil and increase or decrease your dose depending on your response to the medication. Your doctor will help you decide the best time for you to take tadalafil before sexual activity. What side effects can this medication cause? Ask your doctor if you are not sure whether any of your medications contain nitrates. Check the healthdirect’s medicines section for more information about tadalafil. Other uses for this medicine This medication may be prescribed for other uses; ask your doctor or pharmacist for more information.Tadalafil (Cialis) is taken by mouth either as needed before sexual activity or once daily for erectile dysfunction (ED).It’s also taken once daily to treat symptoms from an enlarged prostate (benign prostatic hyperplasia, or BPH).Tadalafil (Cialis) is available both as brand-name and generic tablets. Common side effects of this medication include . 24 Hours Drive-Thru Multi-Lingual Immunizations Lowest Price! F W RICHARDS JR INC $ N Main St Chase City, VA mi Closed () Get . Tadalafil Prices, Coupons and Patient Assistance Programs. Tadalafil is a member of the agents for pulmonary hypertension drug class and is commonly used for Benign Prostatic Hyperplasia, Erectile Dysfunction, and Pulmonary Arterial Hypertension.. Brand names for tadalafil include Cialis. The cost for tadalafil oral tablet 5 mg is around $27 for a supply .