Antihistaminic used in motion sickness is :
**Core Concept**
Antihistamines are a class of medications that work by blocking the action of histamine, a chemical involved in allergic reactions, at the level of the histamine receptor. In the context of motion sickness, antihistamines are used to prevent the symptoms of nausea and vomiting.
**Why the Correct Answer is Right**
The correct answer is a type of antihistamine that is specifically used to prevent motion sickness. This medication works by blocking the action of histamine at the H1 receptor in the central nervous system, which is involved in the regulation of nausea and vomiting. Additionally, it has a sedative effect, which can also contribute to its effectiveness in preventing motion sickness.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is not specifically used for motion sickness. It is primarily used for other indications such as allergies or itching.
**Option B:** This option is incorrect because it is not an antihistamine. It is a different class of medication that is used for other indications.
**Option D:** This option is incorrect because it is not specifically used for motion sickness. It is primarily used for other indications such as allergies or itching.
**Clinical Pearl / High-Yield Fact**
One high-yield fact to remember is that scopolamine, a type of antihistamine, is the most effective medication for preventing motion sickness, but it can have significant side effects such as dry mouth and blurred vision.
**Correct Answer:** C. Dimenhydrinate.