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circulation in a chemically unchanged form e.g if 100mg of a drug are administered orally and 70mg of this drug are absorbed unchanged, the bioavailability is 0.7 or 70%.

AGONIST:- A drug that initiates a physiological response when continued with a receptor.

ANTAGONIST:- A drug that interferes with or inhibits the physiological action of another.

PLACEBO:- This is a medicine which has no inherent pharmacologic activity e.g water honey.

DOSE/SOSAGE: A quantity of a medicine or drug taken or recommended to be taken at a particular time

DRUG ABUSE: I s the habitual taking of illegal drugs

Prophylaxis: Is the medication for precaution

ADVERSE/SIDE EFFECT: Is the non therapeutic and predictable response of a drug action

DRUG ADDICTION:- Is a chronic neurobiological disease in which genetic, psychosocial and environmental factors induce changes in the individuals behavior to compulsively use drugs despite the harm that may result.

POTENCY: The amount of drug misdeals to produce a certain response.

AFFINITY:- is the ability drugs to combine with the receptor.

EFFICACY:- is the maximum pharmacodynamic response that can be elicited by drug.