Classes of
Drugs
Analgesics: Drugs that relieve
pain. There are two main types: non-narcotic analgesics for mild pain, and
narcotic analgesics for severe pain.
Antacids: Drugs that relieve
indigestion and heartburn by neutralizing stomach acid.
Antianxiety Drugs: Drugs that suppress
anxiety and relax muscles (sometimes called anxiolytics, sedatives, or minor
tranquilizers).
Antiarrhythmics: Drugs used to
control irregularities of heartbeat.
Antibacterials: Drugs used to treat bacterial
infections.
Antibiotics: Drugs made from
naturally occurring and synthetic substances that combat bacterial infection.
Some antibiotics are effective only against limited types of bacteria. Others,
known as broad spectrum antibiotics, are effective against a wide range of
bacteria.
Anticoagulants and
Thrombolytics:
Anticoagulants prevent blood from clotting. Thrombolytics help dissolve and
disperse blood clots and may be prescribed for patients with recent arterial or
venous thrombosis.
Anticonvulsants: Drugs that prevent
epileptic seizures.
Antidepressants: There are three
main groups of mood-lifting antidepressants: tricyclics, monoamine oxidase
inhibitors, and selective serotonin reuptake inhibitors (SSRIs).
Antidiarrheals: Drugs used for the
relief of diarrhea. Two main types of antidiarrheal preparations are simple
adsorbent substances and drugs that slow down the contractions of the bowel
muscles so that the contents are propelled more slowly.
Antiemetics: Drugs used to treat
nausea and vomiting.
Antifungals: Drugs used to treat
fungal infections, the most common of which affect the hair, skin, nails, or
mucous membranes.
Antihistamines: Drugs used
primarily to counteract the effects of histamine, one of the chemicals involved
in allergic reactions.
Antihypertensives: Drugs that lower
blood pressure. The types of antihypertensives currently marketed include
diuretics, beta-blockers, calcium channel blocker, ACE (angiotensin- converting
enzyme) inhibitors, centrally acting antihypertensives and sympatholytics.
Anti-Inflammatories: Drugs used to
reduce inflammation - the redness, heat, swelling, and increased blood flow
found in infections and in many chronic noninfective diseases such as
rheumatoid arthritis and gout.
Antineoplastics: Drugs used to treat
cancer.
Antipsychotics: Drugs used to treat
symptoms of severe psychiatric disorders. These drugs are sometimes called
major tranquilizers.
Antipyretics: Drugs that reduce
fever.
Antivirals: Drugs used to treat
viral infections or to provide temporary protection against infections such as
influenza.
Barbiturates: See "sleeping
drugs."
Beta-Blockers: Beta-adrenergic
blocking agents, or beta-blockers for short, reduce the oxygen needs of the
heart by reducing heartbeat rate.
Bronchodilators: Drugs that open up
the bronchial tubes within the lungs when the tubes have become narrowed by
muscle spasm. Bronchodilators ease breathing in diseases such as asthma.
Cold Cures: Although there is
no drug that can cure a cold, the aches, pains, and fever that accompany a cold
can be relieved by aspirin or acetaminophen often accompanied by a
decongestant, antihistamine, and sometimes caffeine.
Corticosteroids: These hormonal
preparations are used primarily as anti-inflammatories in arthritis or asthma
or as immunosuppressives, but they are also useful for treating some
malignancies or compensating for a deficiency of natural hormones in disorders
such as Addison's disease.
Cough Suppressants: Simple cough
medicines, which contain substances such as honey, glycerine, or menthol,
soothe throat irritation but do not actually suppress coughing. They are most
soothing when taken as lozenges and dissolved in the mouth. As liquids they are
probably swallowed too quickly to be effective. A few drugs are actually cough
suppressants. There are two groups of cough suppressants: those that alter the
consistency or production of phlegm such as mucolytics and expectorants; and
those that suppress the coughing reflex such as codeine (narcotic cough
suppressants), antihistamines, dextromethorphan and isoproterenol (non-narcotic
cough suppressants).
Cytotoxics: Drugs that kill or
damage cells. Cytotoxics are used as antineoplastics (drugs used to treat
cancer) and also as immunosuppressives.
Decongestants: Drugs that reduce
swelling of the mucous membranes that line the nose by constricting blood
vessels, thus relieving nasal stuffiness.
Diuretics: Drugs that increase
the quantity of urine produced by the kidneys and passed out of the body, thus
ridding the body of excess fluid. Diuretics reduce water logging of the tissues
caused by fluid retention in disorders of the heart, kidneys, and liver. They
are useful in treating mild cases of high blood pressure.
Expectorant: A drug that
stimulates the flow of saliva and promotes coughing to eliminate phlegm from
the respiratory tract.
Hormones: Chemicals produced
naturally by the endocrine glands (thyroid, adrenal, ovary, testis, pancreas,
parathyroid). In some disorders, for example, diabetes mellitus, in which too
little of a particular hormone is produced, synthetic equivalents or natural
hormone extracts are prescribed to restore the deficiency. Such treatment is
known as hormone replacement therapy.
Hypoglycemics (Oral): Drugs that lower
the level of glucose in the blood. Oral hypoglycemic drugs are used in diabetes
mellitus if it cannot be controlled by diet alone, but does require treatment
with injections of insulin.
Immunosuppressives: Drugs that prevent
or reduce the body's normal reaction to invasion by disease or by foreign
tissues. Immunosuppressives are used to treat autoimmune diseases (in which the
body's defenses work abnormally and attack its own tissues) and to help prevent
rejection of organ transplants.
Laxatives: Drugs that increase
the frequency and ease of bowel movements, either by stimulating the bowel wall
(stimulant laxative), by increasing the bulk of bowel contents (bulk laxative),
or by lubricating them (stool-softeners, or bowel movement-softeners).
Laxatives may be taken by mouth or directly into the lower bowel as suppositories
or enemas. If laxatives are taken regularly, the bowels may ultimately become
unable to work properly without them.
Muscle Relaxants: Drugs that relieve
muscle spasm in disorders such as backache. Antianxiety drugs (minor
tranquilizers) that also have a muscle-relaxant action are used most commonly.
Sedatives: Same as Antianxiety
drugs.
Sex Hormones (Female): There are two
groups of these hormones (estrogens and progesterone), which are responsible
for development of female secondary sexual characteristics. Small quantities
are also produced in males. As drugs, female sex hormones are used to treat
menstrual and menopausal disorders and are also used as oral contraceptives.
Estrogens may be used to treat cancer of the breast or prostate, progestins (synthetic
progesterone to treat endometriosis).
Sex Hormones (Male): Androgenic
hormones, of which the most powerful is testosterone, are responsible for
development of male secondary sexual characteristics. Small quantities are also
produced in females. As drugs, male sex hormones are given to compensate for
hormonal deficiency in hypopituitarism or disorders of the testes. They may be
used to treat breast cancer in women, but either synthetic derivatives called
anabolic steroids, which have less marked side- effects, or specific
anti-estrogens are often preferred. Anabolic steroids also have a "body
building" effect that has led to their (usually nonsanctioned) use in
competitive sports, for both men and women.
Sleeping Drugs: The two main groups
of drugs that are used to induce sleep are benzodiazepines
and barbiturates. All such drugs have a sedative
effect in low doses and are effective sleeping medications in higher doses.
Benzodiazepines drugs are used more widely than barbiturates because they are
safer, the side-effects are less marked, and there is less risk of eventual
physical dependence.
Tranquilizer: This is a term
commonly used to describe any drug that has a calming or sedative effect.
However, the drugs that are sometimes called minor tranquilizers should be
called antianxiety drugs, and the drugs that are sometimes called major
tranquilizers should be called antipsychotics.
Vitamins: Chemicals essential
in small quantities for good health. Some vitamins are not manufactured by the
body, but adequate quantities are present in a normal diet
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