Standard neuroleptic medications have been augmented by the introducti
on of risperidone and clozapine into clinical practice. A great deal o
f attention has also been focused on efficacy and the lower propensity
to extrapyramidal side-effects associated with the new agents. Howeve
r, antipsychotic medication, both old and new, can cause a range of ot
her adverse effects, some of which are serious, and many of which have
the potential greatly to diminish the quality of life of patients who
need to take medication in the long term. Of particular significance
are postural hypotension, cardiotoxicity, peripheral and central antic
holinergic effects, sedation, weight gain, and endocrine and haematolo
gical effects. Various antipsychotic compounds differ substantially wi
th regard to propensity to adverse effects. Side-effects can be minimi
zed by optimization of clinical strategies, including choice of approp
riate drug, slow titration and dosage reduction. It is also vital to e
xplain carefully to both patients and carers the nature of the side-ef
fects which can be anticipated. The choice of antipsychotic is often d
etermined by evaluation of the potential impact of the various adverse
effects on a particular patient. New drugs, such as risperidone, are
well tolerated, with fewer side-effects, and should now be considered
as a first-line option.