The FDA hasn’t approved hydrazine yet. It is used in Russia to fight cancer and is available without a prescription. The full name is Hydrazine Sulfate. If you can’t find it, don’t worry. I posted my request in other areas so I’m sure I’ll get a response either way.
That is about what I had guessed (experimental or folk medicine) since I couldn’t find the drug listed in drug references and Bovril and Marmite (see next questions) were only available in England. I do understand your mom’s need to find something that works.
Your mom needs to find out about side effects of non-approved medicines or their interference with other prescribed medications. I would suggest she discuss this with her doctor as drugs can interfere with each other’s effectiveness.