Drug interactions with Cialis can cause changes in blood pressure and cause your body to metabolize the medicines differently than intended, among other things. Some of the drugs that can potentially interact with Cialis include alcohol, ritonavir, and alpha blockers. Be sure to talk with your healthcare provider about any Cialis drug interactions that may apply to you.
It is not recommended that you drink large quantities of alcohol while taking Cialis. Doing so may cause a decrease in blood pressure, an increase in heart rate, dizziness, or headache.