give someone a dose (或taste) of their own medicine
give someone the same bad treatment that they have given to others以牙还牙；以其治人之道还治其人之身
take one's medicine
submit to something disagreeable such as punishment接受惩罚（或令人讨厌的事物）
We must rely on the honesty and good faith of others, if not, we couldn't put money in the bank, buy food, clothing, or medicine from others, drive across a bridge, get on a plane, go to the dentist--the list is endless.
The man has to wait to get his medicine.
The store doesn't have the prescribed medicine
Something else they need to be careful about is medicines.
Medicine is the treatment of illness and injuries by doctors and nurses.