Possible side effects are: heart palpitation, trembling, irregular heartbeat, heart oppression, agita-tion, shortness of breath, excretion of sugar through the urine, excessive perspiration, diarrhea, weight loss, psychic disorders, etc., as well as symptoms of hypersensitivity. Our experience is that most symptoms consist of trembling of hands, nausea, headaches, high perspiration, and increased heartbeat. These negative side effects can often be eliminated by temporarily reducing the daily dosage. Those who use Cytomel (Liothyronine Sodium) over several weeks will experience a decrease in muscle mass. This can be avoided or delayed by simultaneously taking steroids. For the most part, since Cytomel (Liothyronine Sodium) also metabolizes protein, the athlete must eat a diet rich in protein.