You can't just take medicine if you want to gain weight.

Suggestion: Take the pulse of Chinese medicine and prescribe drugs to achieve the goal of health (gain weight).

Let's measure your blood index first.

Check what trace elements or nutrients the body lacks.

Then find a doctor to make a diagnosis and prescribe some health-care drugs suitable for your physical condition, drugs for invigorating qi and nourishing blood.

Take it according to the course of treatment and recuperate for a period of time. Make the internal organs of the body balance yin and yang, and have sufficient qi and blood.

I believe my body will be stronger and fatter.