How well a drug treat a condition

The stages a drug must go through before its available to the general public for use:

First stage of a drug trail

2nd stage of a drug trial

Final stage of a drugs trial

There are no unwanted side effects

Use of a placebo group, where the patient and doctor don't know who is taking the real drug

The placebo group is a control group that we can compare the effectiveness of the drug against.

Has no effect on the body

A drug that caused limb abnormalities in babies.

A drug used to lower cholesterol (reduce heart disease)

Drugs (such as alcohol, barbiturates, and opiates) that reduce neural activity and slow body functions.

Physical effects caused when the drug is no longer taken

Drugs (such as caffeine, nicotine, and the more powerful amphetamines, cocaine, and Ecstasy) that excite neural activity and speed up body functions.

Any chemical that can affect chemical processes in the body

Done or used for enjoyment , as hobby

capable of treating illness: having properties that can be used to treat illness.