Soft capsules can be made from drugs that are sensitive to light, unstable in hot and humid, or easily oxidized. Some drugs, such as volatile oil, have a sense of photosensitivity, some drugs are prone to decomposition and dispersion in hot and humid, and some drugs are easy to oxidize when prepared and stored. In order to prevent the decomposition of drugs in light, it is possible to add shading materials such as titanium dioxide or iron oxide to the cystic material of the capsule, and good light stability can be achieved. In order to prevent the drug from contact with air, inert gas can be entered during the preparation process. The cystic material of soft capsule is composed of glycerin and gelatin, the wall is thicker, and there is no breathability, so soft capsule is an excellent preparation to prevent drug oxidation. Such as vitamin E pills, active vitamin D3 pills and Luo calcium whole capsules.
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