Abrupt stoppage of the drug can cause withdrawal with fatigue and
is potentially addicting. Phentermine
is not recommended for patients with symptomatic heart disease including rhythm problems.
SIDE EFFECTS: Side effects include diarrhea, dry mouth, constipation, an unpleasant taste, hives, impotence, palpitations, high blood pressure, and fast heart rates. Central nervous system side effects include overstimulation, insomnia, restlessness, tremor, and dizziness.