<p>The efficacy of prednisolone is reduced by Aminoglutethimide, Antacids, Barbiturates, Carbamazepine, Griseofulvin, Mitotane, Phenylbutazone, Phenytoin, Primidone and Rifampin. Prednisolone reduces the amount of potassium in the blood. Digitalis can cause Cardiac arrhythmias if hypokalemia occurs. Immunization should be done very carefully.</p>