Mumbai: Advertising expenditure by over-the-counter (OTC) healthcare brands in 13 key markets, including India, will expand by 7.6 per cent in 2022 and five per cent in 2023, according to Zenith’s new Business Intelligence – OTC Healthcare report published on Monday. Digital will account for 49 per cent of OTC advertising in 2023, up from 46 per cent in 2021, said the report.