Why is methadone called fizzies in street terms?

Methadone is sometimes referred to as "fizzies" in street slang due to its formulation in effervescent tablets or its method of consumption, which may involve dissolving it in liquid, creating a fizzy effect. This colloquial term reflects the drug's association with recreational use and highlights its presence in the illicit drug scene. The nickname can also stem from the way users might mix it with soda or other beverages for easier ingestion.