These PDE5 inhibitors may cause headache, flushing, drop in blood pressure, or other adverse effects. Follow-up support: Make sure you can get the help you need if questions or concerns arise after ordering. According to the FDA, generic medications contain the same active ingredients as brand names, meaning there’s no difference in effectiveness or safety. Contact your medical provider if you experience any side effects during treatment. Patients should seek prompt medical attention if their erection lasts longer than four hours. Some platforms have a digital pharmacy that ships the medication to your home, while others send an electronic prescription to your local pharmacy. It can also interact with many medicines, particularly nitrates used in some types of heart disease and blood pressure medicines.About tadalafil Brand names: Cialis, Adcirca. About tadalafil. Tadalafil is a medicine used to treat erection problems (erectile dysfunction) and symptoms of an enlarged prostate (benign prostate enlargement). It’s also sometimes used to treat pulmonary hypertension (high blood pressure in the blood vessels that supply the lungs). Cialis is a prescription-only medicine for men, aged 18 or over, experiencing symptoms of erectile dysfunction. It comes in the form of a tablet which is taken orally, and can allow you to achieve and maintain an erection hard enough for sexual activity. You’ll need to be sexually stimulated for it to work. 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.