All are true about Thiopentone except:

C i.e. Agent of choice in shock Thiopentone, a pale yellow powder, is ultrasho acting smooth inducing agent because of rapid redistributionQ. It is used in 2.5% conc. at 2.5 - 4.5 mg/kg mixed with 6% anhydrous Na2CO3 as perservativeQ Thiopentone is contraindicated in porphyria, status asthmaticus, severe shock, pericardial temponade and uncompensated myocardial diseaseQ