###Human: Is it advisable to use Methamphetamine by a cancer patient while on treatment? ###Assistant: Hello. Methamphetamine is CNS stimulant, it can have a lot of own side effects, if the doctor is not aware of drug use, many of the side effects of drugs will be difficult to interpret for doctor, drug use can have interaction with chemo drugs and can increase toxicity of drug or under the effect of drug. It is a personal choice of doctor, he should refuse treatment or not.