Laxative teas, such as senna, can cause side effects such as dehydration, which is treated by increasing fluid intake, according to WebMD and MedicineNet. The teas can also cause short-term side effects such as cramps and diarrhea, which go away after stopping tea intake.
Senna is a popular laxative tea that is an FDA-approved nonprescription laxative, explains WebMD. People use senna to treat constipation and clear the bowel before diagnostic tests. It is not for long-term use and should be discontinued if side effects such as diarrhea and watery stools occur to prevent dehydration. If already dehydrated, the tea can make the dehydration worse. Long-term use of the tea can change the balance of electrolytes in the body that can cause heart function disorders and other harmful effects.
Dehydration occurs when too much water is lost in the body and is not replenished, notes MedicineNet. The condition can cause symptoms such as dry mouth, muscle cramps, heart palpitations and weakness. If untreated, dehydration can become severe and cause organs to receive less blood, which can lead to death. To replenish water in the body, frequent small amounts of clear fluids such as water, clear broths, popsicles and Gatorade should be used. The best way to treat dehydration is to prevent it from happening by drinking enough fluid for one's body weight.