@et1055, As others have suggested make sure you put water in your mouth first, then swallow the med, followed by a full glass. Brush your teeth or at least flush your mouth with water or milk after.
You can also try warm salt water swishing. 1/4 teaspoon of salt and baking soda in an 8 oz glass of warm water. Take a swig and roll around in your mouth for 1 minute and spit out. Repeat. It is soothing to the tissue.

Another soothing remedy is to take 1 tablespoon of extra virgin coconut oil in your mouth. Hold it on your tongue to let it melt then swish in your mouth for up to 20 minutes! Do not swallow this!!! Keep swishing through the teeth, around cheeks, over tongue. Then spit into a tissue. Don’t put it down the sink it will eventually clog the drain. Coconut oil has antibiotic/antifungal/antimicrobial properties and helps promotes healthy gums and oral tissue. It helps with burning mouth syndrome.
Have you tried any of these?