By Millie Turner GlaxoSmithKline’s (GSK) one-vial only meningitis vaccine Menveo has been approved by US regulators, which has sweetened investors amid its ongoing legal battle. The British medicines giant and French pharma firm Sanofi are currently undergoing a series of trials in the US over Zantac, a heartburn drug which was recalled in 2019 following claims by the US Food and Drug Administration (FDA) that it produced unacceptable levels of cancer-causing chemicals when exposed to heat.. The litigation has been weighing on GSK’s stock price, which is down more than a third over the year to…