<prompt> Which anesthetic agent is contraindicated in porphyria:PropofolKetamineThiopentoneEtomidate  <response>: Ans: c ThiopentoneRef: KDT 6th ed.374 Thiopentone is an ultrashort acting thiobarbiturate because of rapid redistribution. It has poor analgesic property. Iv injection is very painful. Therefore it is contraindicated unless opioids or N2O has been given. Contraindicated in porphyria patientsAlso KnowEtomidatei insufficiency. Drugs safe in patients with porphyria: Propofol 