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What is the purpose of using a suppository as a drug delivery method?

  1. To widen air passages in the lungs

  2. To decrease frequency and severity of seizures

  3. To thin mucus for easy removal

  4. To absorb the drug through rectum or vagina walls

The correct answer is: To absorb the drug through rectum or vagina walls

Suppositories are solid or semi-solid dosage forms inserted into the rectum or vagina as a means of delivering medication. They are used for drugs that cannot be taken orally, such as those that are destroyed by stomach acid or irritate the stomach lining. Option A is incorrect because it refers to a different drug delivery method, inhalation. Option B is also incorrect as suppositories are not commonly used to treat seizures, and there are other more effective methods available. Option C is incorrect because suppositories do not have any effect on mucus in the lungs. The correct answer, D, explains the purpose of using suppositories as a way to administer medication through the rectum or vagina walls for drugs that are not suitable for oral consumption.