<prompt> Drug of choice for rapid cycling MDP isLithiumCarbamazepineSodium valporateHaloperidol  <response>: C i.e. Sodium Valproate Rapid Cycling MDP - The patient must have at least 4 episodes within 12 months of mood disturbance that meet criteria of major depressive, manic, hypomanic or mixed episode. - It is usually due to use of conventional antidepressant especially tricyclic presence of hypothyroidism. So antidepressants are better avoided but antipsychotics may be used. 