Answer:
absorption, distribution, excretion &metabolism
Step-by-step explanation:
Absorption is the process by which drugs entre the body. given by any route other than intravenously, drugs molecules must cross tissue membranes to enter the brain (ig)
distribution is the process by which drugs move around the body after entering the blood,drug molecules must cross capillary walls to enter the tissues , reach cell membranes and enter cells
Metabolism is the process by which drugs are chemically altered to make them sufficiently water soluble for excretion in urine or faces. metabolism occurs in a variety of body organs and tissues, but chiefly in the liver,gut wall , kidney and skin
Excretion is the process by which drugs leave the body. drugs that are sufficiently water soluble will be excreted unchanged in the urine. lipid-soluble drugs must be modified to water soluble matabolitres before excretion via the kidney or into the intestine via bile