You should also call your insurance company to see if they cover erectile dysfunction medications. Cialis should not be used by patients taking nitrates such as nitroglycerin tablets or patches because the combination of these with Cialis could significantly lower blood pressure and lead to fainting or even death in some men. Some platforms have a digital pharmacy that ships the medication to your home, while others send an electronic prescription to your local pharmacy. FDA encourages anyone aware of a serious side effect, including consumers or patients, to make a MedWatch report. Erectile dysfunction can be caused by a variety of factors , including age, cardiovascular problems, diabetes, and other conditions that affect nerve function or blood flow. If you take nitrates in any form, or are on treatment for pulmonary hypertension , you should not take tadalafil. This allows the smooth muscles in the penis to relax and fill with blood.GoodRx can help you save over 97% off the average retail price of the generic version. Generic Cialis at certain pharmacies is less than $13 with a free GoodRx discount. Save . Cialis is not right for everyone. Only your healthcare provider and you can decide if Cialis is right for you. Ask your healthcare provider if your heart is healthy enough for you to have sexual activity. You should not take Cialis if your healthcare provider has told you not to have sexual activity because of your health problems. 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.