Cialis, like all medications, can cause side effects. Common ones include headache, flushing, nasal congestion, and indigestion. These usually are mild and temporary.
More serious, though rare, side effects include sudden vision loss or hearing loss, prolonged erection (priapism), and heart attack or stroke. Seek immediate medical attention if you experience any of these.
Certain medications can interact negatively with Cialis. This is particularly true for nitrates (used to treat chest pain) as the combination can dangerously lower blood pressure. Always inform your doctor of all medications, supplements, and herbal remedies you are taking before starting Cialis.
| Nitrates | Severe drop in blood pressure |
| Alpha-blockers | Dizziness, lightheadedness |
| CYP3A4 inhibitors (e. g., ketoconazole, erythromycin) | Increased Cialis levels in the blood |
| CYP3A4 inducers (e. g., rifampin, St. John’s Wort) | Decreased Cialis levels in the blood |
Grapefruit juice can also interfere with Cialis metabolism. Avoid consuming it while taking the medication.
This information is not exhaustive. Consult your doctor or pharmacist for a complete list of potential side effects and drug interactions specific to your health situation.
