Brits who take aspirin, codeine or paracetamol have been issued an urgent warning by health bosses . Head of NHS England, Sir Jim Mackey, claims health chiefs are "really worried" about potential medicine shortages as Iran 's blockade of the Strait of Hormuz has resulted in late deliveries. It comes as UK pharmacies have already reported stock issues with common painkillers. Antidepressants and HRT have also been impacted, alongside cancer medications, including Efudix, a chemotherapy cream. "