Tadalafil, the active ingredient in Cialis, can cause side effects. Common ones include headache, flushing, nasal congestion, and indigestion. These usually are mild and temporary. Less common but more serious side effects include vision changes (blurred vision, sudden vision loss), hearing loss, and prolonged erection (priapism).
If you experience any of these serious side effects, seek immediate medical attention. Prolonged erections require prompt medical help to prevent permanent damage.
Tadalafil interacts with certain medications. Nitrates, often prescribed for chest pain, are a significant concern. Combining them with tadalafil can cause a dangerous drop in blood pressure. You should inform your doctor about all medications you are taking, including over-the-counter drugs and supplements, before starting tadalafil.
Alpha-blockers, used to treat high blood pressure and enlarged prostate, can also interact with tadalafil, potentially leading to low blood pressure. Your doctor will carefully monitor you if you take both.
Grapefruit juice can increase tadalafil levels in your blood, potentially intensifying side effects. Avoid grapefruit juice while taking tadalafil.
Alcohol can also increase the risk of side effects. Moderate alcohol consumption is generally acceptable, but excessive drinking should be avoided while using tadalafil.
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.
