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This includes prescription or nonprescription (over-the-counter [OTC]) medicines and herbal or vitamin supplements. It is important to tell your doctor about any heart problems you have now or may have had in the past. This medicine can cause serious side effects in patients with heart problems. Using this medicine with any of the following is usually not recommended, but may be unavoidable in some cases.

Blockade of PDE5, which hydrolyzes cGMP, thus potentiates the physiological NO-mediated erectile response. If you’ve been prescribed ED medication in the past, or if you are looking for a prescription now, you will undoubtedly be asked whether you take nitrates. Nitrates like nitroglycerin can cause a sudden drop in blood pressure and even lead to heart attack or stroke. Patients on nitroglycerin typically have serious cardiovascular issues that make taking ED medication risky in the first place.

Visual disturbances have been reported with phosphodiesterase-5 (PDE-5) inhibitors, including tadalafil. Sudden vision loss in one or both eyes may be a sign of nonarteritic anterior ischemic optic neuropathy (NAION)