Warm antibody hemolytic anemias In drug-induced warm antibody hemolytic anemias, drug withdrawal decreases the rate of hemolysis. With methyldopa - type AIHA, hemolysis usually ceases within 3 weeks; however, a positive antiglobulin test may persist for > 1 year. With hapten-mediated AIHA, hemolysis ceases when the drug is cleared from the plasma.