The government is all set to allow drug companies an increase in line with the change in the annual Wholesale Price Index (WPI). The annual change in WPI, as notified by the government, works out to 12.12% during 2022, the drug prices regulator National Pharmaceutical Pricing Authority (NPPA) said on Monday.The government is all set to allow drug companies an increase in line with the change in the annual Wholesale Price Index (WPI). The annual change in WPI, as notified by the government, works out to 12.12% during 2022, the drug prices regulator National Pharmaceutical Pricing Authority (NPPA) said on Monday.