Western medicines used in modern medicine are generally made by chemical synthesis methods or from natural products. Some antibiotics are directly extracted from microorganisms, and some are synthetic chemical reagents, generally organic chemicals. A considerable part of Western medicines are made by chemical synthesis, so Western medicines are organic chemicals, inorganic chemicals and biological products.

At present, Western medicine is generally common in tablets, capsules, aerosol, etc., each has its own advantages, such as tablets with accurate dosage, low cost and the advantages of taking, storage, transportation, etc., can also be pressed on the name and content of the main drug on the pill, easy to identify, can also be pressed into a concave grain on the pill, to facilitate folding into two halves or a quarter to take; Capsules are generally divided into hard capsules and soft capsules, of which hard capsules are solid or semi-solid drugs filled in two cylindrical hard capsules of different sizes, tightly nested, soft capsules are often called capsules, is the oil or liquid drugs closed in the soft capsule and become a round or oval internal dosage form, they not only look neat and beautiful, easy to swallow, It can also cover up the bad smell of the drug, and quickly disintegrate and release the drug after taking it; Aerosol is developed from the spray, mainly the drug and liquefied gas or compressed air with a valve in the closed pressure cylinder, the use of the pressure of the container, so that the drug is automatically sprayed out in a mist, so that these particles directly to the respiratory tract or absorbed by the skin, to play a role, the absorption rate is no less than the injection, and the process is much simpler than the injection.

It is recommended that patients should apply the drug under the guidance of a doctor to avoid adverse reactions.