Maxide contains diuretic group of drugs which are generally safe. But this combined medications may sometimes cause dizziness, fatigue and stomach upset. Increased sun sensitivity is also been reported rarely. You have not mentioned about your blood pressure level. This medication may not suit you. There are other drugs available to control your BP which can replace this depending upon your current health status. Kindly check your blood sugar level and complete hemogram. Anemia may cause such weakness too. Dont stop this drug unless checking your blood pressure and replaced by another one. Till then you can take proper rest, more liquid diet, fruit juice which may help to control your weakness.