Pharmacology Module 9: Antihistamines

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What type of substances can cause an allergic reaction in sensitized individuals?

Antihistamines

Hormones

Antigens (correct)

Mast cells

What is the primary function of antihistamine drugs?

To release histamine

To promote an allergic response

To stimulate the release of serotonin

To block the action of histamine (correct)

Which of the following is NOT a symptom of an allergic reaction?

Itching

Coughing

Fatigue (correct)

Sneezing

What type of cells play a crucial role in mediating inflammatory responses and allergic reactions?

Mast cells Signup and view all the answers

How many types of histamine receptors are present in the body?

Four Signup and view all the answers

What is the hormone that is released by mast cells during an allergic response and plays a role in stabilizing mood and feelings of well-being?

Serotonin Signup and view all the answers

What is the primary use of antihistamines in the treatment of nasal allergies?

Relieve rhinorrhea, sneezing, and lacrimation Signup and view all the answers

Which antihistamine is considered the drug of choice due to its local anesthetic and anticholinergic activity?

Diphenhydramine Signup and view all the answers

What is the primary mechanism of action of H2 antagonists in dentistry?

Inhibit gastric acid secretion Signup and view all the answers

Which of the following is NOT a use of antihistamines in dentistry?

Prevention of infective endocarditis Signup and view all the answers

Which of the following reactions involves the release of bradykinin?

Type IV cell-mediated delayed reaction Signup and view all the answers

What is the primary function of histamine in the context of acute inflammation?

To increase vascular permeability Signup and view all the answers

What is the primary antibacterial agent of choice for periodontal disease?

Tetracycline Signup and view all the answers

Which receptor is responsible for mediating allergic reactions and is located on blood vessels, bronchial smooth muscle, and intestinal smooth muscle?

H1 receptor Signup and view all the answers

Which antihistamine is used in dentistry primarily for its CNS action?

Promethazine Signup and view all the answers

What is the effect of histamine on intestinal smooth muscle?

Contraction of the smooth muscle Signup and view all the answers

What is the cardiac effect of histamine?

Rapid heartbeat Signup and view all the answers

What is the result of the contraction of bronchiolar smooth muscle due to histamine release?

Bronchoconstriction Signup and view all the answers