July 29, 2016
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(oxymorphone hydrochloride) Injection, USP
(oxymorphone hydrochloride) Suppositories, USP

Opioid Analgesic


NUMORPHAN (oxymorphone hydrochloride, USP), a semi-synthetic opioid substitute for morphine, is a potent analgesic.

NUMORPHAN® (Oxymorphone Hydrochloride)  Structural Formula Illustration

4,5α -Epoxy-3, 14-dihydroxy-17-methylmorphinan-6-one hydrochloride

Oxymorphone hydrochloride is a white or slightly off-white, odorless powder, which is sparingly soluble in alcohol and ether, but freely soluble in water. The molecular weight of oxymorphone hydrochloride is 337.80. The pKa1 and pKa2 of oxymorphone at 37° C are 8.17 and 9.54, respectively. The octanol/aqueous partition coefficient at 37° C and pH 7.4 is 0.98.

NUMORPHAN (oxymorphone) Injection is available in two concentrations, 1 mg/mL, 1 mL ampul and 1.5 mg/mL, 10 mL vial of oxymorphone hydrochloride. In addition, each 1 mg/mL ampul contains 8.0 mg/mL sodium chloride. Each 1.5 mg/mL vial contains 8.0 mg/mL sodium chloride, 1.8 mg/mL methylparaben and 0.2 mg/mL propylparaben. pH for both the ampul and vial is adjusted with hydrochloric acid.

The NUMORPHAN (oxymorphone) Rectal Suppository is available in a concentration of 5 mg of oxymorphone hydrochloride in a base consisting of polyethylene glycol 1000 and polyethylene glycol 3350.

Last reviewed on RxList: 6/24/2008
This monograph has been modified to include the generic and brand name in many instances.

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