Vaccines are not drugs in the traditional sense, as they do not treat or cure diseases. Instead, they prevent diseases by stimulating the body's immune system to produce antibodies against a specific pathogen.

Topical drugs are applied directly to the skin or mucous membranes, while oral drugs are taken by mouth, intravenous drugs are injected into a vein, and subcutaneous drugs are injected just beneath the skin.

Conjugation is a type of chemical reaction in which two molecules are joined together to form a larger molecule. It is not a major type of chemical reaction involved in drug metabolism.

Hallucinations are not a common side effect of drug therapy. Nausea, vomiting, and diarrhea are more common.

Tetracyclines are not a major class of antibiotics. Penicillins, cephalosporins, and macrolides are all major classes of antibiotics.

Surgery is not a drug. Chemotherapy, radiation therapy, and targeted therapy are all drugs used to treat cancer.

Diuretics are not a major type of drug used to treat heart disease. Statins, beta-blockers, and ACE inhibitors are all major types of drugs used to treat heart disease.

Thiazolidinediones are not a common type of drug used to treat diabetes. Insulin, metformin, and sulfonylureas are all common types of drugs used to treat diabetes.

Theophylline is not a common type of drug used to treat asthma. Beta-agonists, anticholinergics, and leukotriene modifiers are all common types of drugs used to treat asthma.

MAOIs are not a common type of drug used to treat depression. SSRIs, SNRIs, and TCAs are all common types of drugs used to treat depression.

Benzodiazepines are not a common type of drug used to treat schizophrenia. Antipsychotics, mood stabilizers, and antidepressants are all common types of drugs used to treat schizophrenia.

Benzodiazepines are not a common type of drug used to treat bipolar disorder. Mood stabilizers, antipsychotics, and antidepressants are all common types of drugs used to treat bipolar disorder.

Antipsychotics are not a common type of drug used to treat epilepsy. Anticonvulsants, mood stabilizers, and benzodiazepines are all common types of drugs used to treat epilepsy.

MAOIs are not a common type of drug used to treat Parkinson's disease. Dopamine agonists, levodopa, and anticholinergics are all common types of drugs used to treat Parkinson's disease.

Benzodiazepines are not a common type of drug used to treat Alzheimer's disease. Cholinesterase inhibitors, memantine, and antipsychotics are all common types of drugs used to treat Alzheimer's disease.