PTCB Pharmacology #1

Question 1

Integrase inhibitors are used to treat which of the following conditions?

Accepted Answer

HIV/AIDS

Answer

Integrase inhibitors are a class of antiretroviral drugs specifically designed to treat Human Immunodeficiency Virus (HIV) infection, which can progress to Acquired Immunodeficiency Syndrome (AIDS). These medications work by blocking the action of HIV integrase, an enzyme essential for the virus to integrate its genetic material into the DNA of host cells. By preventing this crucial step, integrase inhibitors stop the virus from replicating and spreading.

Question 2

Statins act by inhibiting which of these enzymes' effects?

Accepted Answer

HMG-CoA reductase

Answer

Statins are a class of drugs primarily used to lower cholesterol levels in the blood. They achieve this by competitively inhibiting the enzyme HMG-CoA reductase. This enzyme plays a critical role in the mevalonate pathway, which is responsible for the endogenous synthesis of cholesterol in the liver, thereby reducing overall cholesterol production.

Question 3

A H2 receptor antagonist is which of the following drugs?

Accepted Answer

Ranitidine

Answer

Ranitidine is a well-known H2 receptor antagonist, commonly used to treat conditions like heartburn, ulcers, and gastroesophageal reflux disease (GERD). It works by blocking histamine H2 receptors in the stomach's parietal cells. This action reduces the secretion of gastric acid, thereby alleviating symptoms and promoting healing.

Question 4

Proton-pump inhibitors are used to lower body levels of what?

Accepted Answer

Gastric acid

Answer

Proton-pump inhibitors (PPIs) are a class of drugs that reduce the production of gastric acid in the stomach. They achieve this by irreversibly binding to and inhibiting the H+/K+-ATPase enzyme system, also known as the proton pump, located in the parietal cells of the stomach lining. This mechanism effectively blocks the final step in acid secretion, leading to a significant and prolonged reduction in gastric acid levels.

Question 5

Which of the vitamins listed below is water soluble?

Accepted Answer

Vitamin C

Answer

Vitamin C, also known as ascorbic acid, is a classic example of a water-soluble vitamin. Unlike fat-soluble vitamins (A, D, E, K), water-soluble vitamins are not stored in the body in significant amounts and are readily excreted in urine. Therefore, a regular dietary intake is necessary to maintain adequate levels.

Pharmacy Practice Test

Pharmacy Practice Test

PTCB Pharmacology #1