Click here to visit Google's help center for more information on this specific policy.
Google restricts the promotion of healthcare-related content such as the following:
over-the-counter medication
prescription drugs
unapproved pharmaceuticals and supplements
pregnancy and fertility-related products
sexual enhancement treatments
The restrictions that apply to this content may vary depending on the product you're promoting and the countries that you're targeting. Some content, such as unapproved pharmaceutical supplements, may not be promoted anywhere.
Depending on the content you’re promoting and the countries where your ads appear, you may need to apply for preauthorization with Google before advertising healthcare-related content.