Incidence of adverse reactions to commonly prescribed psychopharmacological agents during early phase of therapy.

Five hundred and ninety two patients attending a psychiatric department as outpatients or as inpatient were included in this study. Details regarding age, sex, diagnosis and drugs prescribed were entered in a proforma. The information regarding drugs prescribed, dosage and the types of reactions were noted. All patients were followed up for a period of 3 to 4 weeks. Incidence of adverse reactions was calculated as percentage of the total number of prescriptions of the same group of drugs. The incidence of reactions to antipsychotic and antidepressants ranged from 35 to 46.9%. The incidence of reactions to haloperidol was higher than the reactions to other drugs. Antianxiety drugs were found to produce only minimal reactions. Two or more drugs prescribed together was associated with a higher incidence of reactions. Among the 193 patients who were reported to have reactions, 65.8% had extrapyramidal symptoms. The frequency of these reactions were highest with antipsychotic drugs haloperidol, chlorpromazine, trifluoperazine and thioridazine in that order. Dystonic reactions were reported within one to two days after the initiation of therapy in a large group of patients. Anticholinergic side effects were associated with prescription of tricyclic antidepressants andphenothiazines. Drowsiness, giddiness and postural hypotension were the other reactions associated with tricyclics.