Antidote++(3)

The Antidote++(3) is a members-only Old School RuneScape item — “3 doses of super strong antipoison potion.”. Its Grand Exchange buy limit is 4,000 per 4 hours. Right now it buys at 4,575 gp and sells at 5,280 gp — a net margin of 600 gp (13.1% ROI) after the 2% Grand Exchange tax of 105 gp. High alchemy yields 172 gp.

To flip it, place a buy offer near 4,575 gp and a sell offer near 5,280 gp; the spread minus GE tax is your profit. Confidence figures are model estimates from live OSRS Wiki prices, not guarantees — flip responsibly.