Avoid exceeding 100 mg of Viagra within a 24-hour period, as excessive doses may lead to severe headaches, low blood pressure, and orthostasis—a sudden drop in blood pressure upon standing — which can result in fainting. Additionally, higher doses carry the risk of priapism, a painful and prolonged erection lasting over 4 hours.
The recommended maximum dosage of Cialis is 20 mg per day. Exceeding this limit may heighten the risk of side effects, including significant drops in blood pressure or priapism.