"Medication effective in relieving and preventing the symptoms of radiation poisoning."
Anti-radiation tablets can be found from expeditions in the wasteland. They can be used from the medicine cabinet.
One dose of anti-radiation tablets will cause a green + symbol to be displayed next to the character's health stat. As long as this symbol is present the character is immune to radiation poisoning. This immunity lasts 4 days in game so if you happen to use this, you can spare one slot to equip supporting item for expedition with consideration for travelling time, as its effect may wear off when members are still outside.
Quest Traders' Turf yeilds player with 30 tablets once completed. For each tablet, it values 40 on trading.