My Mother Inadvertently Gave My Brother One Of Her Medications.

My mother inadvertently gave my brother one of her medications. He takes two kinds of medications. Lisinopril 10 mg in the evening. He hasn't taken that one yet tonight. In the morning he takes levodopa carbipoda 25-100 in the morning. He took one of those this morning. He mistakenly took hydrxychlqine/plaquinil 200 mg, which is one of my mother's medications. He feels fine and he is doing alright. Should we seek other medical attention for him?