A schedule 4 drug is outlined in the Poisons Act 1964 as, "Substances, the use or supply of which should be by or on the order of persons permitted by State or Territory legislation to prescribe and should be available from a pharmacist on prescription." United States
Diazepam is controlled as a Schedule IV substance under the Controlled Substances Act of 1970. Judicial executions
The states of California and Florida offer diazepam to condemned inmates as a pre-execution sedative as part of their lethal injection program, although the state of California has not executed a prisoner since 2006. In August 2018, Nebraska used diazepam as part of the drug combination used to execute Carey Dean Moore, the first death row inmate executed in Nebraska in over 21 years. Veterinary uses
Diazepam is used as a short-term sedative and anxiolytic for cats and dogs, sometimes used as an appetite stimulant. It can also be used to stop seizures in dogs and cats. References
Further reading
Dean L (2016). "Diazepam Therapy and CYP2C19 Genotype". In Pratt VM, McLeod HL, Rubinstein WS,  et al. (eds.). Medical Genetics Summaries. National Center for Biotechnology Information (NCBI). PMID 28520370. Bookshelf ID: NBK379740. Thomas Hardman (April, 2021) "Valium FAQ- 20 Frequently Asked Questions" Pharmacologist at GenZen Laboratories. External links

"Diazepam". Drug Information Portal. U.S. National Library of Medicine. "Diazepam Nasal Spray". MedlinePlus. "Diazepam". Resource Center. Chemwatch.
OFCD syndrome is inherited in an X-linked dominant pattern with male lethality. Management
References
Lenz Microphthalmia Syndrome