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Routes Of Drug Administration > Pharmacology

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Total Questions : 5

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Question 1:

Which of the following routes of drug administration has the fastest onset of action?

A. Oral B. Intravenous C. Sublingual D. Topical

Answer and Explanation

Choice A:

Oral administration has a slower onset of action because drugs must first pass through the gastrointestinal tract and be absorbed into the bloodstream.

Choice B:

Intravenous administration has the fastest onset of action because drugs are injected directly into the bloodstream, allowing for immediate distribution throughout the body.

Choice C:

Sublingual administration has a faster onset of action than oral administration, but slower than intravenous administration because drugs are absorbed through the mucous membranes under the tongue and must then enter the bloodstream.

Choice D:

Topical administration has a slower onset of action because drugs must first pass through the skin or mucous membranes before entering the bloodstream.

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Question 2:

Which of the following routes of drug administration bypasses first-pass metabolism?

A. Oral B. Intravenous C. Sublingual D. Rectal

Answer and Explanation

Choice A:

Oral administration does not bypass first-pass metabolism because drugs must first pass through the liver before entering the systemic circulation.

Choice B:

Intravenous administration bypasses first-pass metabolism because drugs are injected directly into the bloodstream, avoiding metabolism in the liver before entering the systemic circulation.

Choice C:

Sublingual administration partially bypasses first-pass metabolism because some of the drugs is absorbed directly into the bloodstream through the mucous membranes under the tongue, but some may still be swallowed and subject to first-pass metabolism.

Choice D:

Rectal administration partially bypasses first-pass metabolism because some of the drugs is absorbed directly into the bloodstream through the rectal mucosa, but some may still be subject to first-pass metabolism.

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Question 3:

Which of the following factors influence drug absorption?

A. Blood flow to the absorption site B. The surface area is available for absorption C. The pH at the absorption site D. All of the above

Answer and Explanation

Choice A:

Choice B:

Choice C:

Choice D:

Blood flow to the absorption site, surface area available for absorption, and pH at the absorption site can all affect drug absorption. For example, increased blood flow can increase drug absorption by delivering more drugs to the absorption site, while a larger surface area can increase absorption by providing more space for drug molecules to pass through. The pH at the absorption site can also affect drug absorption by altering drug solubility and ionization.

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Question 4:

Which of the following statements about drug distribution is true?

A. Drugs are distributed evenly throughout the body B. Drugs can cross cell membranes by passive diffusion or active transport C. Drugs are only distributed to organs with high blood flow D. Drugs cannot cross the blood-brain barrier

Answer and Explanation

Choice A:

Drugs are not distributed evenly throughout the body, but rather are distributed according to factors such as blood flow, tissue permeability, and protein binding.

Choice B:

Drugs can cross cell membranes by passive diffusion or active transport to reach their site of action within cells or tissues. Passive diffusion occurs when drugs move from an area of high concentration to an area of low concentration, while active transport requires energy and a carrier protein to move drugs against a concentration gradient.

Choice C:

Because while organs with high blood flow such as the liver and kidneys receive a large proportion of a drug dose, drugs can also be distributed to other organs and tissues.

Choice D:

Some drugs can cross

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Question 5:

What is meant by pharmacokinetics?

A. The study of how drugs are absorbed, distributed, metabolized, and excreted by the body. B. The study of how drugs interact with target cells or tissues to produce therapeutic effects. C. The study of how drugs are formulated and delivered for administration. D. The study of how drugs are regulated and controlled by government agencies.

Answer and Explanation

Choice A:

Pharmacokinetics refers to the study of how drugs are absorbed, distributed, metabolized, and excreted by the body. It involves understanding the factors that can influence the movement of drugs within the body and how these factors can affect drug efficacy and safety.

Choice B:

It describes pharmacodynamics, not pharmacokinetics. Pharmacodynamics is the study of how drugs interact with target cells or tissues to produce therapeutic effects.

Choice C:

It describes the formulation and delivery of drugs, not their absorption, distribution, metabolism, and excretion. The formulation and delivery of drugs are important aspects of drug development and administration but are not part of pharmacokinetics.

Choice D:

It describes the regulation and control of drugs by government agencies, not their absorption, distribution, metabolism, and excretion. The regulation and control of drugs are important aspects of ensuring their safety and efficacy but are not part of pharmacokinetics.

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