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An EpiPenÂ® is an autoinjector which delivers a carefully metered dose of epinephrine intramuscularly via a spring-loaded needle. This device is designed to be used in the emergency treatment of severe allergic reactions.
The pH range is 2.2-5.0. Each 0.3 mL in the EpiPen Jr Auto-Injector contains 0.15 mg epinephrine, 1.8 mg sodium chloride, 0.5 mg sodium metabisulfite, hydrochloric acid to adjust pH, and Water for Injection. The pH range is 2.2-5.0.