Medical Information Only: This medication is not sold on this site. The information provided is for reference purposes only. Please consult your local physician or pharmacist for treatment.

Levallorphanum [Inn-Latin]: Full Drug Profile

Medically reviewed by Min Clinic Staff | Updated: January 2026

Levallorphanum [Inn-Latin] - General Information

An opioid antagonist with properties similar to those of naloxone; in addition it also possesses some agonist properties. It should be used cautiously; levallorphan reverses severe opioid-induced respiratory depression but may exacerbate respiratory depression such as that induced by alcohol or other non-opioid central depressants. (From Martindale, The Extra Pharmacopoeia, 30th ed, p683)

 

Pharmacology of Levallorphanum [Inn-Latin]

Levallorphanum [Inn-Latin], an opioid antagonist similar to naloxone, is used to treat drug overdoses. Levallorphanum [Inn-Latin] differs from naloxone in that it also possesses some agonist properties. It is an analogue of levelorphanol that counteracts the actions of narcotic analgesics such as morphine. It is used especially in the treatment of respiratory depression due to narcotic overdoses. Levallorphanum [Inn-Latin] prevents or reverses the effects of opioids including respiratory depression, sedation and hypotension. Also, it can reverse the psychotomimetic and dysphoric effects of agonist-antagonists such as pentazocine.

 

Levallorphanum [Inn-Latin] for patients

 

Levallorphanum [Inn-Latin] Interactions

 

Levallorphanum [Inn-Latin] Contraindications

Levallorphan is contraindicated in patients known to be hypersensitive to it.

 

Additional information about Levallorphanum [Inn-Latin]

Levallorphanum [Inn-Latin] Indication

For the complete or partial reversal of narcotic depression, including respiratory depression, induced by opioids.

Mechanism Of Action
Levallorphanum [Inn-Latin] antagonizes opioid effects by competing for the same receptor sites. It binds to the opioid mu receptor and the nicotinic acetylcholine receptor alpha2/alpha3.
Generic Name
Levallorphan
Drug Category
Analgesic Antagonists; Morphine Antidotes; Antinarcotic Agents; Narcotic Antagonists
Drug Type
Small Molecule; Approved
Other Brand Names containing Levallorphan
Levallofano [Dcit]; Levallorphane [Inn-French]; Levallorphanum [Inn-Latin]; Levalorfano [Inn-Spanish]; Lorfan; Naloxiphan;
Absorption
Rapidly absorbed.
Toxicity (Overdose)
Oral, rat LD50: 109±4 mg/kg
Biotransformation
Hepatic.
Half Life
1 hour
Chemical IUPAC Name
adamantan-1-amine
Chemical Formula
C19H25NO
Organisms Affected
Humans and other mammals