The Department of Health advised the public to remain indoors and minimize outdoor activities.[25] Demand for N95 masks increased rapidly, with some stores inflating its prices to ₱200 apiece from the standard ₱25–40.[26][27] The Department of Trade and Industry responded by dispatching teams to monitor and observe the movement of retail prices in the market and warned businesses against raising the prices.[28] Manila Mayor Isko Moreno threatened to revoke the permits of medical supplies firms in the city involved in the price hike of masks.[29] Mercury Drug, a major pharmaceutical chain, pledged to replenish supply for the masks where prices would remain steady and it would not hoard supply.[30][31]