An authorized generic of Ammonul was sold before, but it isn’t sold now. Ask your pharmacist whether a regular generic (sodium benzoate and sodium phenylacetate) is available.
Source: FDA, updated October 30, 2026
How to pay the least
Ask for the cash price
Generic sodium benzoate and sodium phenylacetate
No pharmacy we check posts a price for it.
- Ask your pharmacy for the cash price of generic sodium benzoate and sodium phenylacetate.Find pharmacies near you
- Ask one or two other pharmacies too. Cash prices for the same generic can differ a lot from store to store.
A regular generic has the same active ingredient as Ammonul, and the FDA requires it to work the same way.
Compare every option
Question
Brand nameAmmonul
Authorized genericsodium benzoate and sodium phenylacetate
Regular genericsodium benzoate and sodium phenylacetate
What you’d pay
Not soldNo longer sold
Not soldNo longer sold
Cash priceAsk the pharmacy
Same as Ammonul?
–
–
Same active ingredientFillers and dyes can differ
Details for each option
Details for
Brand nameNot sold
Ammonul itself isn’t sold as a prescription anymore. Its generic versions, if any, are in the other tabs.
Authorized genericNot sold now
Regular genericWho makes it
2 companies sell a generic of Ammonul that the FDA rates a substitute. A pharmacy fills whichever one it stocks. To get a certain maker, ask for it by name; most pharmacies can order it in a day or two.
It’s mostly filled by specialty pharmacies. Your prescriber’s office or insurer can tell you which one to use.
-
Omnivium Pharmaceuticals100 mg/mL / 100 mg/mL
Made by Ailex Pharmaceuticals
How it looks, what’s in it, NDCs
100 mg/mL / 100 mg/mL
Package NDC Carton of 50 mL 81665-203-01 100 mg/mL / 100 mg/mL
Package NDC Carton of 50 mL 81665-204-01 Inactive ingredients: water, sodium hydroxide, hydrochloric acid
-
Zydus Lifesciences100 mg/mL / 100 mg/mL
Made by Navinta
How it looks, what’s in it, NDCs
100 mg/mL / 100 mg/mL
Package NDC Carton of 50 mL 68382-396-01 Inactive ingredients: water, sodium hydroxide, hydrochloric acid
Who sells it: FDA and Medicaid records, updated weekly. Each maker’s page, card and program is from its own site.
What it’s used for
- High blood ammonia from a urea cycle disorder
What the FDA label says
AMMONUL is a nitrogen binding agent indicated as adjunctive therapy for the treatment of acute hyperammonemia and associated encephalopathy in patients with deficiencies in enzymes of the urea cycle.
Source: the FDA label for Ammonul (Ucyclyd Pharma Inc.), January 12, 2018. Full label on DailyMed
Prices change: confirm with the pharmacy before you fill. drugalt.com/drug/ammonul/