A field survey, based on a representative sample of children aged 12 to 16 years was carried out in three different areas of Malaysia. The data derived from the study have revealed that 10.5 per cent of them used drugs for non-medical reasons. Drug use was more common among boys (11.9 per cent) than girls (8.6 per cent). The highest frequency of drug was found in the youngest group--12-year-old children (13.5 per cent). The use of barbiturate and/or non-barbiturate sedatives (5.5 per cent) ranked first. This was followed in descending order by tranquillizers (4.5 per cent), simultants/amphetamines (3.9 per cent), heroin (3.6 per cent), morphine and/or opium (3.9 per cent), the hallucinogens (3.1 per cent) and cannabis (2.7 per cent).