Which type of medications can be purchased without a prescription?

Over-the-counter medications are the correct choice for the type of medications that can be purchased without a prescription. These medications are generally considered safe and effective for use by the general public without the need for a healthcare professional's supervision. They are typically used to treat common ailments such as headaches, colds, or allergies and can be found in pharmacies, grocery stores, and various retail outlets.

Prescription medications, on the other hand, require a doctor's authorization for purchase due to their potential side effects, interactions with other medications, or the need for professional oversight in their use. Controlled substances are a subset of prescription medications that are regulated more strictly due to their potential for abuse and addiction. Herbal remedies, while they can often be purchased without a prescription, do not fall under the same category as over-the-counter medications, which are specifically regulated for safety and efficacy in treating specific conditions.