The extent to which the active ingredient of a drug dosage form becomes available at the site of drug action or in a biological medium believed to reflect accessibility to a site of action.

The study of the physical and chemical properties of a drug and its dosage form as related to the onset, duration, and intensity of its action.

The use of chemical agents in TERRORISM. This includes the malevolent use of nerve agents, blood agents, blister agents, and choking agents (NOXAE).

The use or threatened use of force or violence against persons or property in violation of criminal laws for purposes of intimidation, coercion, or ransom, in support of political or social objectives.

A species of ORTHOPOXVIRUS causing infections in humans. No infections have been reported since 1977 and the virus is now believed to be virtually extinct.

Personnel trained to provide the initial services, care, and support in EMERGENCIES or DISASTERS.

Planned and coordinated pre-event accumulation of ESSENTIAL DRUGS and medical supplies.

Tactical warfare using incendiary mixtures, smokes, or irritant, burning, or asphyxiating gases.

Management of public health organizations or agencies.