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Which one of these is the best way to preserve drugs for intravenous use?

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Which one of these is the best way to preserve drugs for intravenous use?

(a) Lyophilisation

(b) Drying

(c) Freezing

(d) In solution form

The question was asked in an interview for job.

My enquiry is from Prodrugs in portion Prodrugs & Excretion of Drugs of Drug Biotechnology

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Right choice is (a) Lyophilisation

The best I can explain: Lyophilisation or freeze drying is the easiest and important step for intravenous drugs. Here the product is first frozen and then dried to become powdered form. In this step with the free water, even the bound water is also removed. Thus decreasing the probability of contamination.

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