Examples include stimulants, amphetamines, and antihistamines. In mainland China, modafinil is strictly controlled like other stimulants, such as amphetamines and methylphenidate. Carney later used barbiturates, amphetamines, and alcohol substitutes. Various stimulant drugs (such as a number of substituted amphetamines) are catecholamine analogues. Harsher sentences are given for those convicted of manufacturing amphetamines such as methamphetamine. Often Ecstasy is combined with amphetamines or other drugs. Brand then started to use illegal drugs such as cannabis, amphetamines, LSD, and ecstasy. He again entered rehab in February 2001 for addiction to Vicodin, methadone, amphetamines, and alcohol. The country is one of the major producers of illicit amphetamines and other synthetic drugs. This was found to be comparatively higher than hallucinogens (26%) and amphetamines (22%). These neurotransmitters mimic the feeling of amphetamines. They were heavily involved in the production of PCP, marijuana and amphetamines. Urine and blood were removed to test for traces of amphetamines or other substances. In 2001, he overdosed on prescription amphetamines. She battled obesity and tension via amphetamines and sleeping pills.