Gris-Peg

I am taking Gris-Peg 250mg tablets to kill the ringworm on my scalp. It says for me to not drink acoholic beverages while taking this medication. What are the side-effects if I go drinking like once a week? Are the side-effects severe? Does it decrease the effectiveness of the drug? I read on a website that all it does is increase the effect of alcohol on the body and my body may get flushed. Is that all? Thank you in advance