Final answer:
The excretion of drugs typically occurs through the kidneys via processes such as glomerular filtration, tubular secretion, and tubular reabsorption.
Step-by-step explanation:
Excretion of drugs typically occurs through the excretory system, mainly in the kidneys. Water-soluble drugs can be excreted in the urine through processes such as glomerular filtration, tubular secretion, and tubular reabsorption. Small drug molecules can be filtered by the glomerulus, while larger molecules or drugs bound to plasma proteins cannot be filtered and are not readily eliminated.
Some drugs can be eliminated by carrier proteins that enable secretion of the drug into the tubule lumen. There are specific carriers that eliminate basic or acidic drugs. Drugs may also be both filtered and reabsorbed passively along a concentration gradient.