The main articles for this category are Drug and Pharmaceutical drug. Many of the categories for particular types of drugs are listed in Category:Drugs by target organ system and Category:Drugs by mechanism of action. Articles about drugs that are used and/or abused on account of their Psychoactive effects are found in the subcategory, Category:Psychoactive drugs.
Confidence votes 37. You need to be 18+. There are other requirements and exceptions as well. For example if a family member (immediate family) was dying and needed a kidney that would be an exception and you can give a kidney. If you are over 18 please concider giving a kidney.
Physically small people are not acceptable as blood donors as they have lower blood volumes and may not be able to safely lose a full pint of blood. One may not donate blood while one has the flu. But one can donate blood after exposure to someone with the flu provided the potential donor feels and has no symptoms. A minimum age limit exists as to how old a person must be in order to donate blood (usually age 17). There is no maximum age limit. Pregnancy and recent childbirth rule one out as a blood donor.