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Why is Promethazine given as an injection in the deep muscle?

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robo 9 Aug 2009

from https://www.drugs.com/pro/promethazine-injection.html

Promethazine HCl Injection should not be given by the subcutaneous route; evidence of chemical irritation has been noted, and necrotic lesions have resulted following subcutaneous injection. The preferred parenteral route of administration is by deep intramuscular injection.

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