Cialis (tadalafil) treats erectile dysfunction by inhibiting phosphodiesterase type 5 (PDE5), an enzyme that breaks down cyclic guanosine monophosphate (cGMP). Increased cGMP levels relax blood vessels in the penis, facilitating blood flow and enabling erections. This mechanism is specific to the penis, minimizing systemic effects.
Common Side Effects
While generally well-tolerated, Cialis can cause side effects. Headache is common, alongside nasal congestion and back pain. These are usually mild and transient. Less frequent, but more significant, side effects include flushing and dyspepsia.
Rare but Serious Side Effects
Rarely, Cialis can cause vision problems, including optic neuritis. This is a serious condition affecting the optic nerve and potentially causing vision loss. It’s crucial to immediately contact your doctor if you experience any sudden vision changes, such as blurred vision, decreased vision, or changes in color perception, while using Cialis. A similar risk exists for hearing problems, specifically sudden hearing loss or tinnitus. Seek immediate medical attention for any unusual auditory changes.
Other potential side effects include muscle aches and prolonged erection (priapism), requiring prompt medical intervention. Always discuss your medical history with your physician before starting Cialis to minimize risk.
Medication Interactions
Cialis interacts with some medications, especially nitrates used to treat chest pain. Combining these can dangerously lower blood pressure. Always inform your doctor of all medications you’re taking, including over-the-counter drugs and supplements, to avoid potentially harmful interactions.
