A survey conducted by pharmacists working in four psychiatric hospitals in Israel to assess the prescribing of psychotropic drugs revealed that polypharmacy was common: patients were receiving up to 11 different drugs and up to six different psychotropic drugs. The average number of psychotropic drugs per patient was two. The most popular combinations of drugs used were; one containing an antipsychotic drug(s) and an antiparkinson drug(s) and the other was a combination of more than one antipsychotic agent. Up to 30 doses per day were taken orally by one patient. Drugs that could have easily been administered on a once-a-day time schedule were often administered several times a day. Differences in prescribing patterns in the various hospitals and often times on different wards of the same institution could more easily be attributed to different educational backgrounds, habits and personal beliefs and perhaps the physician's experience as well, rather than to the types of patients treated.