Bought some amino acid pills. Amongst ingredients is 38mg l-tryptophan. I also take 15mg lexapro (escitalopram). Will this cause any issues?

No. But the Amino Acid pills are a waste of money. Your body will break them down as any other protein and generate 4 calories of energy/gram. Don't get your medical information from friends, tv or the internet. Food is a better source of protein than pills.