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There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).
A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
Medication errors are three times higher among children and infants than with adults.