There are many other treatments for erectile dysfunction. Ask your pharmacist for a list of the ingredients. Medications other than those listed above may interact with Cialis Tadalafil. This is a rare condition that more likely to occur if you have heart disease, high blood pressure, High Cholesterol, Diabetes, or eye problems, if you are more than 50 years old, or if you smoke. Potential Side Effects and Interactions While Cialis is generally safe, like all medications, it can have side effects. Alcohol: Consumption of alcohol may decrease the ability to achieve an erection and may also temporarily decrease blood pressure, causing dizziness and fainting. Symptoms may include sudden urges to urinate urgency , difficulty in starting urination hesitancy , a weak urine stream, and more frequent urination — especially at night.Cialis is approved by the FDA to treat erectile dysfunction (ED). Our medical team can prescribe Cialis 5mg, 10mg, and 20mg. The starting dose we generally recommend is 10mg. Tadalafil is the name for the active chemical ingredient in Cialis. PDE-5 inhibitors is the name of the group of medicines. headache *. upset stomach. runny nose. back pain *. upper respiratory infection. heartburn *. muscle pain. For a list of side effects reported by people taking Cialis in clinical trials, including. not available over-the-counter (OTC) Was this helpful? How does Cialis work? Cialis works by increasing blood flow to the penis to help a person get and maintain an erection. It also blocks.