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What exactly is a quasi-drug?

Under the Pharmaceutical and Medical Device Act (PMD Act), certain products are categorized as either cosmetics or quasi-drugs in Japan. Quasi-drugs are products that are somewhere in between cosmetics and pharmaceuticals; they have received the necessary permits required under the aforementioned law regarding their specific effects.

Quasi-drugs include:
Oxidative hair dyeing products, hair waving or straightening products, depilatories, breath fresheners, deodorant products, talcum powder, anti-dandruff products, products to prevent melanin spots and freckles, and so on.

Quasi-drugs are labeled as such, even if they appear to be essentially cosmetics. Products such as deodorant products and oxidative hair dyeing products come under this category.
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