(naloxone hydrochloride) Injection, USP
NARCAN (naloxone hydrochloride injection, USP), an opioid antagonist, is a synthetic congener of oxymorphone. In structure it differs from oxymorphone in that the methyl group on the nitrogen atom is replaced by an allyl group.
Naloxone hydrochloride occurs as a white to slightly off-white powder, and is soluble in water, in dilute acids, and in strong alkali; slightly soluble in alcohol; practically insoluble in ether and in chloroform.
NARCAN (naloxone) injection is available as a sterile solution for intravenous, intramuscular and subcutaneous administration in three concentrations: 0.02 mg, 0.4 mg and 1 mg of naloxone hydrochloride per mL. pH is adjusted to 3.5 ± 0.5 with hydrochloric acid.
The 0.02 mg/mL strength is an unpreserved, paraben-free formulation containing 9 mg/mL sodium chloride.
The 0.4 mg/mL vial contains 8.6 mg/mL of sodium chloride and 2 mg/mL of methylparaben and propylparaben as preservatives in a ratio of 9:1. The 0.4 mg/mL ampul is also available in an unpreserved, paraben-free formulation containing 9 mg/mL of sodium chloride.
The 1 mg/mL vial contains 8.35 mg/mL of sodium chloride and 2 mg/mL of methylparaben and propylparaben as preservatives in a ratio of 9:1. The 1 mg/mL ampul is also available in an unpreserved, paraben-free formulation containing 9 mg/mL of sodium chloride.
What are the possible side effects of naloxone (Narcan)?
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have a serious side effect such as:
- chest pain, fast or irregular heartbeats;
- dry cough, wheezing, feeling short of breath;
- sweating, severe nausea or vomiting;
- severe headache, agitation, anxiety, confusion, ringing in your ears;
- seizure (convulsions);
- feeling like you might pass out; or
- slow heart rate, weak pulse, fainting, slow...
Last reviewed on RxList: 3/20/2009
This monograph has been modified to include the generic and brand name in many instances.
Additional Narcan Information
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