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24 HR memantine hydrochloride 21 MG Extended Release Oral Capsule — RxCUI 996603

RxNorm drug concept · Semantic clinical drug
RxCUI 996603 Semantic clinical drug · SCD ● Current RxNorm concept 39 FDA products 77 package NDCs Snapshot Jul 14, 2026

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Compiled from public NLM RxNorm and FDA (openFDA NDC directory) data sources. Editorial policy

What you’re looking at: the standardized identity of one medicine, as the U.S. drug-data system sees it. Below — every FDA-listed product, package code, price benchmark, and billing code that maps to it.

🗂️ Key Facts

RxCUI996603
Official name24 HR memantine hydrochloride 21 MG Extended Release Oral Capsule
Concept typeSemantic clinical drug (SCD)
RxNorm statusCurrent RxNorm concept
Also known asmemantine HCl 21 MG 24HR Extended Release Oral Capsule
FDA products mapped39
Package NDCs mapped77
Reported Medicaid activity (SDUD)7,501 prescriptions · 18 state & territory Medicaid programs · latest period Q4 2025
RxNorm release07/06/2026
Snapshot dataJul 14, 2026

📖 Skip the Codes — Read It in Plain English.

Our pharmacist-built guide to Memantine: what it is, how it’s used, side effects, and interactions.

📗 Our plain-language guide HelloPharmacist
  • Memantine helps manage the symptoms of moderate to severe Alzheimer's disease. It works by blocking certain brain receptors that are overstimulated in Alzheimer's, which is thought...
  • What does memantine actually do for Alzheimer's disease?
  • No — memantine can be taken with or without food, whichever is easier to stick with. For the extended-release capsule form, food does slightly affect the timing of when the drug pe...
  • Just skip the missed dose and take your next dose at the regularly scheduled time. Never double up to make up for a missed one. If you've missed several days in a row, don't just r...
📖 Read our full Memantine guide →

🕸️ Concept Web — How 24 HR memantine hydrochloride 21 MG Extended Rel... Connects

One RxCUI never lives alone. Follow the path from the raw ingredient down to the exact strength-and-form concepts FDA products carry — every stop is a real RxNorm concept with its own identifier. Hover or focus any chip for what it means.
This page's concept 24 HR memantine hydrochloride 21 MG Extended Release Oral Capsule RxCUI 996603

Every web starts here: one RxCUI, one fixed meaning in the RxNorm vocabulary.

  1. Ingredients 2

    The active substance itself — no strength, form, or brand attached yet.

    • Memantine 6719
    • Memantine hydrochloride 236685
  2. Brand names 1

    The same medicine's trade names. A brand name alone says nothing about strength or form.

    • Namenda 405206
  3. Dose forms 13

    The ingredient poured into a form — tablet, solution, cream — still without one fixed strength.

    • Memantine Extended Release Oral Capsule 996593
    • Memantine hydrochloride Extended Release Oral Capsule 2647021
    • Memantine Oral Product 1159792
    • Memantine Pill 1159793
    • Memantine hydrochloride Oral Product 2660255
    • Memantine hydrochloride Pill 2660593
    • Memantine Extended Release Oral Capsule [Namenda] 996596
    • Memantine hydrochloride Extended Release Oral Capsule [Namenda] 2658253
    • +5 more in this family
  4. Clinical & branded drugs 3

    Ingredient + strength + dose form. These are the concepts real FDA products actually carry.

    • Memantine hydrochloride 21 MG 996602
    • 24 HR memantine hydrochloride 21 MG Extended Release Oral Capsule [Namenda] 996605
    • Memantine hydrochloride 21 MG [Namenda] 996604
  5. Packs 2

    Fixed collections of drugs packaged and sold together, like dose packs.

Showing up to 8 concepts per family — 16 of 21 stored related concepts drawn.
These are official RxNorm vocabulary relationships — how concepts name and organize the same medicine. They do not establish therapeutic equivalence or substitutability: two concepts appearing in one web is never a statement that products can be swapped.

🔀 Generic ⇄ Brand Crosswalk

The same medicine has an unbranded (generic) identity and one or more brand-name identities — each with its own RxCUI. This is a naming relationship in RxNorm, not a statement that any two products are substitutable.

Generic (Clinical) Concepts

Brand-Name Concepts

  • 24 HR memantine hydrochloride 21 MG Extended Release Oral Capsule [Namenda] SBD · 996605
  • Memantine hydrochloride 21 MG [Namenda] SBDC · 996604
  • Memantine Extended Release Oral Capsule [Namenda] SBDF · 996596
  • Memantine hydrochloride Extended Release Oral Capsule [Namenda] SBDFP · 2658253
  • Namenda Oral Product SBDG · 1178754
  • Namenda Pill SBDG · 1178755
  • Namenda BN · 405206
  • {7 (24 HR memantine hydrochloride 14 MG Extended Release Oral Capsule [Namenda]) / 7 (24 HR memantine hydrochloride 21 MG Extended Release Oral Capsule [Namenda]) / 7 (24 HR memantine hydrochloride 28 MG Extended Release Oral Capsule [Namenda]) / 7 (24 HR memantine hydrochloride 7 MG Extended Release Oral Capsule [Namenda]) } Pack [Namenda 28 Titration Pack] BPCK · 996633

📦 FDA Products & Package NDCs

39 products · 77 package NDCs
77 package NDCs map to RxCUI 996603 in the current snapshot — up to 50 per page. Each linked NDC opens its full package page.
Package NDC Package Brand / generic name Labeler Marketing start
00904-6734-61 100 BLISTER PACK in 1 CARTON (0904-6734-61) / 1 CAPSULE, EX... memantine hydrochloride Major Pharmaceuticals 2018-02-20
00904-6735-61 100 BLISTER PACK in 1 CARTON (0904-6735-61) / 1 CAPSULE, EX... memantine hydrochloride Major Pharmaceuticals 2018-02-20
16571-0852-03 30 CAPSULE, EXTENDED RELEASE in 1 BOTTLE, PLASTIC (16571-852... Memantine Hydrochloride Rising Pharma Holdings, Inc. 2025-06-01
16571-0853-03 30 CAPSULE, EXTENDED RELEASE in 1 BOTTLE, PLASTIC (16571-853... Memantine Hydrochloride Rising Pharma Holdings, Inc. 2025-06-01
16571-0853-09 90 CAPSULE, EXTENDED RELEASE in 1 BOTTLE, PLASTIC (16571-853... Memantine Hydrochloride Rising Pharma Holdings, Inc. 2025-06-01
16571-0854-03 30 CAPSULE, EXTENDED RELEASE in 1 BOTTLE, PLASTIC (16571-854... Memantine Hydrochloride Rising Pharma Holdings, Inc. 2025-06-01
16571-0855-03 30 CAPSULE, EXTENDED RELEASE in 1 BOTTLE, PLASTIC (16571-855... Memantine Hydrochloride Rising Pharma Holdings, Inc. 2025-06-01
16571-0855-09 90 CAPSULE, EXTENDED RELEASE in 1 BOTTLE, PLASTIC (16571-855... Memantine Hydrochloride Rising Pharma Holdings, Inc. 2025-06-01
33342-0219-07 30 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (33342-219-07) Memantine hydrochloride Macleods Pharmaceuticals Limited 2025-08-28
33342-0219-12 10 BLISTER PACK in 1 CARTON (33342-219-12) / 10 CAPSULE, EX... Memantine hydrochloride Macleods Pharmaceuticals Limited 2025-08-28
33342-0220-07 30 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (33342-220-07) Memantine hydrochloride Macleods Pharmaceuticals Limited 2025-08-28
33342-0220-12 10 BLISTER PACK in 1 CARTON (33342-220-12) / 10 CAPSULE, EX... Memantine hydrochloride Macleods Pharmaceuticals Limited 2025-08-28
33342-0221-07 30 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (33342-221-07) Memantine hydrochloride Macleods Pharmaceuticals Limited 2025-08-28
33342-0221-12 10 BLISTER PACK in 1 CARTON (33342-221-12) / 10 CAPSULE, EX... Memantine hydrochloride Macleods Pharmaceuticals Limited 2025-08-28
33342-0222-07 30 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (33342-222-07) Memantine hydrochloride Macleods Pharmaceuticals Limited 2025-08-28
33342-0222-12 10 BLISTER PACK in 1 CARTON (33342-222-12) / 10 CAPSULE, EX... Memantine hydrochloride Macleods Pharmaceuticals Limited 2025-08-28
59651-0404-30 30 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (59651-404-30) MEMANTINE HYDROCHLORIDE Aurobindo Pharma Limited 2021-08-09
59651-0404-90 90 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (59651-404-90) MEMANTINE HYDROCHLORIDE Aurobindo Pharma Limited 2021-08-09
59651-0405-30 30 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (59651-405-30) MEMANTINE HYDROCHLORIDE Aurobindo Pharma Limited 2021-08-09
59651-0405-90 90 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (59651-405-90) MEMANTINE HYDROCHLORIDE Aurobindo Pharma Limited 2021-08-09
59651-0406-30 30 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (59651-406-30) MEMANTINE HYDROCHLORIDE Aurobindo Pharma Limited 2021-08-09
59651-0406-90 90 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (59651-406-90) MEMANTINE HYDROCHLORIDE Aurobindo Pharma Limited 2021-08-09
59651-0407-30 30 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (59651-407-30) MEMANTINE HYDROCHLORIDE Aurobindo Pharma Limited 2021-08-09
59651-0407-90 90 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (59651-407-90) MEMANTINE HYDROCHLORIDE Aurobindo Pharma Limited 2021-08-09
59651-0408-28 1 BLISTER PACK in 1 CARTON (59651-408-28) / 1 KIT in 1 BLIS... MEMANTINE HYDROCHLORIDE Aurobindo Pharma Limited 2021-08-09
65162-0782-03 30 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (65162-782-03) Memantine Hydrochloride Amneal Pharmaceuticals LLC 2017-12-22
65162-0782-09 90 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (65162-782-09) Memantine Hydrochloride Amneal Pharmaceuticals LLC 2017-12-22
65162-0782-50 500 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (65162-782-50) Memantine Hydrochloride Amneal Pharmaceuticals LLC 2017-12-22
65162-0783-03 30 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (65162-783-03) Memantine Hydrochloride Amneal Pharmaceuticals LLC 2017-12-22
65162-0783-09 90 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (65162-783-09) Memantine Hydrochloride Amneal Pharmaceuticals LLC 2017-12-22
65162-0783-50 500 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (65162-783-50) Memantine Hydrochloride Amneal Pharmaceuticals LLC 2017-12-22
65162-0784-03 30 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (65162-784-03) Memantine Hydrochloride Amneal Pharmaceuticals LLC 2017-12-22
65162-0784-09 90 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (65162-784-09) Memantine Hydrochloride Amneal Pharmaceuticals LLC 2017-12-22
65162-0784-50 500 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (65162-784-50) Memantine Hydrochloride Amneal Pharmaceuticals LLC 2017-12-22
65162-0785-03 30 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (65162-785-03) Memantine Hydrochloride Amneal Pharmaceuticals LLC 2017-12-22
65162-0785-09 90 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (65162-785-09) Memantine Hydrochloride Amneal Pharmaceuticals LLC 2017-12-22
65162-0785-50 500 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (65162-785-50) Memantine Hydrochloride Amneal Pharmaceuticals LLC 2017-12-22
68180-0246-06 30 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (68180-246-06) memantine hydrochloride Lupin Pharmaceuticals, Inc. 2018-02-20
68180-0247-06 30 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (68180-247-06) memantine hydrochloride Lupin Pharmaceuticals, Inc. 2018-02-20
68180-0247-09 90 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (68180-247-09) memantine hydrochloride Lupin Pharmaceuticals, Inc. 2018-02-20
68180-0248-06 30 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (68180-248-06) memantine hydrochloride Lupin Pharmaceuticals, Inc. 2018-02-20
68180-0249-06 30 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (68180-249-06) memantine hydrochloride Lupin Pharmaceuticals, Inc. 2018-02-20
68180-0249-09 90 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (68180-249-09) memantine hydrochloride Lupin Pharmaceuticals, Inc. 2018-02-20
68382-0546-06 30 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (68382-546-06) Memantine hydrochloride Zydus Pharmaceuticals USA Inc. 2018-04-08
68382-0546-16 90 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (68382-546-16) Memantine hydrochloride Zydus Pharmaceuticals USA Inc. 2018-04-08
68382-0546-77 10 BLISTER PACK in 1 CARTON (68382-546-77) / 10 CAPSULE, EX... Memantine hydrochloride Zydus Pharmaceuticals USA Inc. 2018-04-08
68382-0547-06 30 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (68382-547-06) Memantine hydrochloride Zydus Pharmaceuticals USA Inc. 2018-04-08
68382-0547-16 90 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (68382-547-16) Memantine hydrochloride Zydus Pharmaceuticals USA Inc. 2018-04-08
68382-0547-77 10 BLISTER PACK in 1 CARTON (68382-547-77) / 10 CAPSULE, EX... Memantine hydrochloride Zydus Pharmaceuticals USA Inc. 2018-04-08
68382-0548-06 30 CAPSULE, EXTENDED RELEASE in 1 BOTTLE (68382-548-06) Memantine hydrochloride Zydus Pharmaceuticals USA Inc. 2018-04-08
Observed labelers: Amneal Pharmaceuticals LLC (12) · Zydus Lifesciences Limited (12) · Zydus Pharmaceuticals USA Inc. (12) · Aurobindo Pharma Limited (9) · Macleods Pharmaceuticals Limited (8) · Lupin Pharmaceuticals, Inc. (6) · +4 more — this is the FDA-listed mapping footprint, not sales, inventory, availability, or market share.

🗃️ Sources & Limits

Atlas generation902fddb9-e9c1-4004-bf4c-dba4d51037c7
openFDA export observedJul 14, 2026
RxNorm release07/06/2026
Methodology2026-07-full-catalog-v1
  • A shared RxCUI does not prove interchangeability. Products mapped to the same concept are not thereby equivalent or substitutable — equivalence is a separate, product-level determination.
  • Listing here does not establish approval or coverage. Appearing in this snapshot is a data observation, not an FDA approval status or a payer coverage decision.
  • Missing data never means zero. A silent dataset (no price, no billing code, no utilization) means no observation — not that the real-world value is zero.
  • Counts describe the mapping footprint. Product, package, and labeler counts are the FDA-listed mapping footprint in this snapshot — not sales, inventory, availability, or market share.
This product uses publicly available data from the U.S. National Library of Medicine (NLM), National Institutes of Health, Department of Health and Human Services; NLM is not responsible for the product and does not endorse or recommend this or any other product.

Machine-readable JSON

Reference information about drug-concept identifiers and public regulatory data — not medical advice. Talk to your pharmacist or prescriber about your own medication.