As there are currently no vaccine for the novel coronavirus researchers are testing if existing drugs used to treat some viral infections can also fight COVID-19. Studies are underway in many countries to test the effectiveness of malaria pills - chloroquine (CQ) and hydroxychloroquine (HCQ ) – in treating COVID-19 cases. Despite very scant evidence HCQ and CQ have been touted as a possible treatment for COVID-19. US President Donald Trump has called these drugs a game-changer in the fight against Covid-19. However a new study has warned that hydroxychloroquine and chloroquine may be toxic when combined with a common diabetes drug.