Can cause sensitivity to sunlight, short-term drowsiness, and high blood pressure. It appears to raise the metabolic rate by increasing harmone production by the thyroid gland. Do not take if pregnant or breast-feeding. If suffering from a thyroid illness, take only under professional supervision. It is possible to froth at the mouth to death.
External use is safe.
Ephedrine-type alkaloids strongly stimulate the central nervous system. Khat produce an effect somewhat similar to that of coca leaves. Withdrawal can produce lethargy. In Africa, it is taken in old age, stimulating and improving mental function. Khat is used in Germany to counter obesity.