What prescription drugs can slow the metabolizing of marijuana in your system?
Nothing, if you're taking drugs...I suggest you stop >:O
Prescription drugs require a prescription from a doctor to get. Non-prescription drugs can be bought by anyone. Certain eye medicine and deodorant can be considered prescription drugs that have to be ordered. Other types of drugs, like advil and other pain killers can be bough as non-prescription drugs.
This answer should not affect the way you treat such harmful substances such as drugs. But if this is for a project or experiment, then it is marijuana. Answer Teens are abusing and mixing prescription drugs that they obtain from other people with disastrous results. Marijuana and cocaine use are not far behind.