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Last Updated: December 15, 2025

Details for New Drug Application (NDA): 021964


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NDA 021964 describes RELISTOR, which is a drug marketed by Salix Pharms and Salix and is included in two NDAs. It is available from one supplier. There are twelve patents protecting this drug and three Paragraph IV challenges. Additional details are available on the RELISTOR profile page.

The generic ingredient in RELISTOR is methylnaltrexone bromide. There are three drug master file entries for this compound. One supplier is listed for this compound. Additional details are available on the methylnaltrexone bromide profile page.
Summary for 021964
Tradename:RELISTOR
Applicant:Salix Pharms
Ingredient:methylnaltrexone bromide
Patents:6
Pharmacology for NDA: 021964
Mechanism of ActionOpioid Antagonists
Suppliers and Packaging for NDA: 021964
Tradename Generic Name Dosage NDA Application Type Supplier National Drug Code Package Code Package
RELISTOR methylnaltrexone bromide SOLUTION;SUBCUTANEOUS 021964 NDA Salix Pharmaceuticals, Inc. 65649-551 65649-551-02 1 VIAL, SINGLE-DOSE in 1 CARTON (65649-551-02) / .6 mL in 1 VIAL, SINGLE-DOSE
RELISTOR methylnaltrexone bromide SOLUTION;SUBCUTANEOUS 021964 NDA Salix Pharmaceuticals, Inc. 65649-551 65649-551-03 7 BLISTER PACK in 1 CARTON (65649-551-03) / 1 SYRINGE in 1 BLISTER PACK / .6 mL in 1 SYRINGE

Profile for product number 001

Active Rx/OTC/Discontinued:RXDosage:SOLUTION;SUBCUTANEOUSStrength12MG/0.6ML (12MG/0.6ML)
Approval Date:Apr 24, 2008TE:RLD:Yes
Patent:12,303,592Patent Expiration:Aug 3, 2027Product Flag?YSubstance Flag?Delist Request?
Patented Use:TREATMENT OF OIC IN ADULTS WITH ADVANCED ILLNESS OR PAIN CAUSED BY ACTIVE CANCER WHO REQUIRE OPIOID DOSAGE ESCALATION FOR PALLIATIVE CARE
Patent:12,303,592Patent Expiration:Aug 3, 2027Product Flag?YSubstance Flag?Delist Request?
Patented Use:TREATMENT OF OPIOID-INDUCED CONSTIPATION (OIC) IN ADULTS WITH CHRONIC NON-CANCER PAIN, INCLUDING PATIENTS WITH CHRONIC PAIN RELATED TO PRIOR CANCER OR ITS TREATMENT WHO DO NOT REQUIRE FREQUENT (E.G., WEEKLY) OPIOID DOSAGE ESCALATION
Patent:8,247,425Patent Expiration:Dec 31, 2030Product Flag?Substance Flag?Delist Request?
Patented Use:TREATMENT OF OPIOID-INDUCED CONSTIPATION

Expired US Patents for NDA 021964

Applicant Tradename Generic Name Dosage NDA Approval Date Patent No. Patent Expiration
Salix Pharms RELISTOR methylnaltrexone bromide SOLUTION;SUBCUTANEOUS 021964-003 Sep 27, 2010 9,669,096 ⤷  Get Started Free
Salix Pharms RELISTOR methylnaltrexone bromide SOLUTION;SUBCUTANEOUS 021964-002 Sep 27, 2010 10,376,584 ⤷  Get Started Free
Salix Pharms RELISTOR methylnaltrexone bromide SOLUTION;SUBCUTANEOUS 021964-001 Apr 24, 2008 8,552,025 ⤷  Get Started Free
Salix Pharms RELISTOR methylnaltrexone bromide SOLUTION;SUBCUTANEOUS 021964-001 Apr 24, 2008 9,669,096 ⤷  Get Started Free
>Applicant >Tradename >Generic Name >Dosage >NDA >Approval Date >Patent No. >Patent Expiration

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