Amantadine HCL is an FDA approved drug that is used to treat different illnesses. It comes available in both capsule and liquid form. This medication is not a vaccine. It is described as being a stable white or nearly white in color crystalline powder that is freely soluble in water. It is also freely soluble in alcohol and in chloroform as well. It is used for two purposes and that is antiviral and antiparkinsonian drug.