Taking a double dose of Kamagra can significantly increase the risk of adverse effects, especially in older individuals. Common side effects of Kamagra include headaches, dizziness, and flushing. Doubling the dosage could exacerbate these side effects, causing discomfort and potentially posing health risks. Moreover, there's a concern regarding priapism, a rare but serious condition characterized by prolonged and painful erections. Older individuals may be at higher risk for priapism, and doubling the Kamagra dosage could potentially increase this risk.