HCQ

Hydroxychloroquine is a medication primarily used as an antimalarial and as a disease-modifying antirheumatic drug (DMARD). It is sold under brand names like Plaquenil and belongs to the 4-aminoquinoline class. It works by interfering with parasite growth in malaria and by modulating the immune system in autoimmune conditions, though its exact mechanisms in rheumatologic diseases are not fully understood.