Narcotics
Narcotics are used to treat pain and include substances such as morphine, methadone and heroin. Narcotics are highly addictive, and the "high" associated with their use can impair mental abilities (judgment, balance and concentration). Also, athletes who continue to compete with an injury run the risk of further damage or complications.

Protein Hormones
Adrenocorticotrophic Hormone (ACTH) is a naturally occurring protein hormone that is secreted by the pituitary gland and stimulates the production of hormones from the adrenal cortex (cortisone, corticosteroids, glucocorticoids). These adrenal cortex hormones are important in reducing inflammation in injuries and allergic responses. So, by using ACTH to stimulate internal adrenal cortex hormones, an athlete could mask an injury. Possible side effects include stomach irritation, ulcers, mental irritation and long-term effects (weakening bones and muscles).

Cortisone
Cortisone is one of the adrenal cortex hormones mentioned above. Clinically, it is injected to reduce inflammation in injuries and allergic responses. The advantages and side effects of its use are the same as with ACTH.

Local Anesthetics
Local anesthetics, like those used by your dentist or doctor, are used to mask pain in the short-term without impairing mental abilities. They include novocaine, procaine, lidocaine and lignocaine. Athletes may use them so that they can continue to compete while injured. The major problem with their use is the possibility of further aggravating an injury.