Older adults reach higher blood levels of alcohol even when drinking commensurate amounts as younger people.
Opiate withdrawal can include symptoms such as extreme agitation, anxiety, tremors, muscle aches, hot and cold flashes, nausea, vomiting, and diarrhea.
Use of amphetamines can cause death, some of which have occurred as a consequence of burst blood vessels in the brain, heart failure, or very high fever.
Methadone users who want to come off of the drug will typically benefit from gradual cessation followed by a drug-free drug rehabilitation program.