If a drug is patented, must the efficacy described in the patent be true?

Let's talk about patents first. A product has a patent, not necessarily a patent on efficacy, such as packaging, raw materials, production technology and so on.

So when you say that a drug has a patent, it does not necessarily have a good effect on its curative effect.

In addition, even if the efficacy is patented, how can the efficacy be completely determined? Need a lot of clinical verification, and some will have individual differences.

Don't go near the patent promotion in the advertisement.