The safety and effectiveness of Cialis when used with other treatments for impotence has not been studied. Physicians should discuss with patients the potential for CIALIS to augment the blood-pressure-lowering effect of alpha-blockers and antihypertensive medications. The decision of availability is completely up to the company marketing the product. If you are a Mayo Clinic patient, this could include protected health information. 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. By controlling the enzyme, tadalafil helps to maintain an erection after the penis is stroked by increasing blood flow to the penis. Journal of research in pharmacy practice, 5 3 , —Pregnancy Birth control needs Breastfeeding Precautions For professionals Drug Images What is Cialis? Cialis is a brand-name prescription medication. It’s FDA-approved to . 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 themselves within 48 hours. A small . Tadalafil (Oral Route) Description and Brand Names Before Using Proper Use Precautions Side Effects Products and services Description and Brand Names Drug information .