Illicit manufacturing of nimetazepam (sold as Erimin-5) is prevalent in the region. Abuse of nimetazepam continued to rise throughout the 2010s. Seizures of illicitly manufactured Erimin-5 tablets paralleled the seizures of methamphetamine seizures in Malaysia. A small seizure of 46 illicit Erimin-5 tablets were tested for their physical and chemical characteristics. The active ingredient, adulterant, major diluent, and dyes make up the chemical characteristics of a tablet. The results indicated that nimetazepam was the most common active ingredient in the vast majority of the tablets seized. Lactose was detected as a major diluent in the majority of the samples, followed by mannitol and then calcium phosphate dibasic dihydrate. Sunset yellow was found in most of the tablet samples either alone or in combination with other dyes such as tartrazine and ponceau 4R to give the tablets a peach/orange colour. Green tablets in the samples contained brilliant blue and tartrazine dyes. Diazepam, which is primarily an anxiolytic, was the active ingredient in only one tablet out of the 46. Nitrazepam, a powerful sedative-hypnotic, which is also nimetazepams parent drug, was found to be a minor compound together with a caffeine as a major compound in three of the tablets.