In older adults, Zhewitra 40 mg, a medication commonly used for erectile dysfunction, may lead to several side effects due to age-related changes in metabolism and increased sensitivity to medications. The most likely side effects include dizziness, headache, flushing, and gastrointestinal disturbances like nausea and indigestion. 

Older adults are also at a higher risk of experiencing low blood pressure (hypotension), especially if they have preexisting heart conditions or are taking medications like nitrates. Additionally, visual disturbances, such as blurred vision or sensitivity to light, may occur. It’s important to consult with a healthcare provider before starting Zhewitra to minimize these risks.