There is no such thing as back pain after taking kidney tonic is a good thing. If back pain occurs after using the medicine, it is recommended to stop the medicine in time and seek medical treatment. Do not take medication on your own. Kidney tonics can be categorized into kidney yin tonics and kidney yang tonics. Common drugs for tonifying kidney yin, such as Zuo Gui Wan, have the effect of nourishing the kidney and tonifying yin (nourishing the yin in the kidney), and can be used to treat kidney yin insufficiency (insufficient yin fluid in the kidney), but patients with cold and fever should avoid using it. Common medicines for tonifying kidney yang, such as Right Angelica Pill, have the effect of warming and tonifying kidney yang (warming and replenishing kidney yang), and can be used for treating kidney yang deficiency (insufficient yang in the kidneys), the contraindications of which are not clear. The waist is the capital of the kidney, and patients with kidney deficiency will often show signs of back pain. If there are relevant symptoms, patients should go to the hospital in time and under the guidance of the doctor for relevant treatment. Do not self-medicate.