摘要：

1. A pharmaceutical preparation comprising, in aqueous solution, a mixture of gelatine and formaldehyde, the concentration of said gelatine in said solution being at least 10% and the concentration of formaldehyde at least 0.2%, said mixture containing uniformly distributed therethrough a drug, said preparation coagulating not less than about 6 minutes after mixing said gelatine and said formaldehyde to a gelatin gel of reduced solubility in water having said drug uniformly distributed throughout said gel.

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