It can also interact with many medicines, particularly nitrates used in some types of heart disease and blood pressure medicines. This allows the smooth muscles in the penis to relax and fill with blood. People taking nitrates like nitroglycerin Nitrostat or isosorbide mononitrate Imdur should not take PDE5 inhibitors, as doing so could result in a dangerous drop in blood pressure. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. It works to treat erectile dysfunction by increasing blood flow to the penis during sexual stimulation. Generic vs.It is necessary to collect nettles in ecologically clean places, as far as possible from roads. Cialis 20mg in its generic form is used for the treatment of ED. Get ready to find the best prices for different doses, including 5mg. Fast shipping. headache. indigestion. back pain. muscle pain. flushing. stuffy nose. Patients who get back pain and muscle aches usually get them 12 to 24 hours after taking Cialis and these usually go away by. Tadalafil (Cialis) is used to treat erectile dysfunction (ED, impotence; inability to get or keep an erection), and the symptoms of benign prostatic hyperplasia (BPH; an enlarged prostate) which include difficulty urinating (hesitation, dribbling, weak stream, and incomplete bladder emptying), painful urination, and urinary frequency and urgency in adult men.