The saga of tainted valsartan has taken another turn with an online pharmacy that tests its medications before dispensing them finding yet another probable carcinogen in lots of the blood pressure medication from multiple manufacturers. The pharmacy filed a citizen petition asking the US FDA to tighten its globally harmonized limit for the residual solvent.

The FDA has tied the contamination of blood pressure drugs by probable carcinogens to an approved switch in manufacturing to a process that uses certain solvents. Now an online pharmacy says it has discovered the solvents are as bad as the impurities they have been creating and has criticized the FDA for not taking steps […]