What is suramin used to treat?
To test this hypothesis, Naviaux and his team turned to the drug suramin, which is a known 'antipurinergic' - a molecule that can inhibit purinergic signalling. Suramin has been around since 1916, and is used in the treatment of the parasitic disease African trypanosomiasis (sleeping sickness).
https://www.sciencealert.com/a-100-year-old-drug-shows-extremely-promising-results-for-treating-autism-symptoms
Is suramin the only antipurinergic drug?
Suramin is just the oldest antipurinergic drug available, and the only one that inhibits the particular purinergic receptors that cause autism. Many more antipurinergic drugs are in development. Suramin is just the first of a whole new class of medicines, like the first statin for high cholesterol or the first beta blocker for high blood pressure.
https://health.ucsd.edu/news/topics/Suramin-Autism/Pages/Q-and-A.aspx