Explain photostability ?
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As per ICH Q1B guideline photostability is performed to
evaluate the light exposure does not result in unacceptable
change or to demonstrate intrinsic photostability
characteristics of new drug substances and products.
The photo stability testing should be carried out on at
least one primary batch of the drug product.
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The substances which are stable OR remain unchanged in the presence of light are called as photostable and the phenomenon called as photostability
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