Zhewitra 40 mg contains vardenafil, which is a phosphodiesterase-5 (PDE5) inhibitor, similar to tadalafil in Forzest. Its primary use is for erectile dysfunction (ED) by increasing blood flow to the penis. Regarding headaches: Common Side Effect – Headache is actually one of the most frequently reported side effects of vardenafil. This happens because PDE5 inhibitors cause vasodilation, or widening of blood vessels, not just in the penis but sometimes in the head and other parts of the body. This temporary change in blood flow can trigger mild to moderate headaches. Timing – Headaches usually appear 30 minutes to a Zhewitra 40 mg hours after taking the medication, coinciding with its peak effect. Severity – Most headaches are mild and short-lived. Drinking water, resting, or taking mild pain relief (if your doctor approves) can help. Severe or persistent headaches are uncommon but should prompt medical attention. Precautions – If you have a history of migraines, uncontrolled high blood pressure, or cardiovascular issues, discuss with your doctor before taking Zhewitra, as the vasodilatory effect can exacerbate certain conditions. In short: Zhewitra doesn’t treat headaches—it may actually cause them as a side effect. Most are mild and temporary, but monitoring and discussing with a healthcare provider is important if headaches are frequent or severe.