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Sentence Correction: Parallelism Questions - Overview

The availability of lay information about the effectiveness of pharmaceuticals vs. natural remedies poses a problem for physicians concerned about patients switching from medications prescribed by qualified practitioners to self-medicating with nutritional supplements.

Incorrect.

This answer choice is grammatically incorrect. The parallelism from A to B requires that A and B are the same part of speech. Here, however, A is a noun (medications) and B is a verb (self-medicating).

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Incorrect.

This answer choice is grammatically incorrect. The parallelism from A to B requires that A and B are the same part of speech. Here, however, A is a verb (medicating) and B is a noun (self-medication).

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In addition, it is illogical to say medicating with prescriptions. One medicates with a drug or a substance, not with a prescription.

Incorrect.

While this answer choice corrects the grammatical mistake in the original sentence, it is stylistically flawed. The phrase nutritional supplements being used for self-medication is awkward and wordy. The word being denotes the use of supplements was already ongoing when people switch to them, which makes no sense.

There is an answer choice which conveys  the message of the sentence in a clearer and more concise way. Find it!

Incorrect.

This answer choice is grammatically incorrect. The parallelism from A to B requires that A and B are logically parallel. Here, however, A refers to instructions from the doctor (medical prescriptions) while B refers to the actual substance being used (supplements)

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Very good!

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This answer choice correctly creates the parallelism from A to B by using two logically parallel V+ing verbs: from using medications ... to self-medicating... .

medications prescribed by qualified practitioners to self-medicating with nutritional supplements
medicating with prescriptions from qualified practitioners to self-medication with nutritional supplements
medications prescribed by qualified practitioners to nutritional supplements being used for self-medication
medical prescriptions by qualified practitioners to nutritional supplements for self-medication
using medications prescribed by qualified practitioners to self-medicating with nutritional supplements