Consult your doctor before using Cialis, especially if you have pre-existing health conditions. Common side effects include headache, flushing, nasal congestion, and indigestion. Less common, but still possible, are back pain and muscle aches. These usually resolve on their own, but persistent or severe side effects require immediate medical attention.
Serious Side Effects
Rare but serious side effects include sudden vision loss, hearing loss, or prolonged erection (priapism). Seek immediate medical help if you experience any of these. Prolonged erection can cause permanent damage.
Drug Interactions
Cialis can interact negatively with certain medications. This is particularly true for nitrates (used to treat angina) and alpha-blockers (used to treat high blood pressure or enlarged prostate). Combining Cialis with these medications can cause a dangerous drop in blood pressure.
| Nitrates | Severe drop in blood pressure | Avoid Cialis if taking nitrates. |
| Alpha-blockers | Dizziness, fainting | Inform your doctor about all medications before taking Cialis. |
| CYP3A4 inhibitors (e. g., ketoconazole, ritonavir) | Increased Cialis levels in the blood | Your doctor may adjust your Cialis dosage. |
| CYP3A4 inducers (e. g., rifampin, St. John’s wort) | Decreased Cialis levels in the blood | Your doctor may adjust your Cialis dosage. |
Other Considerations
Grapefruit juice can also affect Cialis metabolism, so limit your consumption while taking it. Always inform your doctor and pharmacist about all medications, supplements, and herbal remedies you’re using to avoid potential interactions.
