Phenylmercuric nitrate is a mixture of phenylmercuric nitrate and phenylmercuric hydroxide. It occurs as a white crystalline material that is sparingly soluble in water and slightly soluble in alcohol. It is used in concentrations of 1:10,000 to 1:50,000 to preserve injectable drugs against bacterial contamination. A disadvantage to organomercuri-als is that their bacteriostatic efficacy is reduced in the presence of serum.
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