What information is included in a formulary?

A formulary is a comprehensive list that is often used by health insurance plans to specify which prescription medications are covered and the preferred options. Option A is correct because it includes essential information about the medications selected by the plan, which encompasses not only the names of these drugs but also their proper dosages. This ensures that both healthcare providers and patients are aware of the treatment options approved by the insurance company, promoting effective and safe medication use.

While the other options may seem relevant in the context of medication management, they do not accurately describe what a formulary typically contains. The improper dosage for a plan's drug, as mentioned in another option, would not be relevant or acceptable, as formulary information focuses on safe and effective dosages. Pricing on drugs and calculations of drug prices may be part of the broader discussion around drug management and cost but are not the primary focus of a formulary, which is centered on the selection and appropriate use of medications.