Not to be administered via microbiological filter. Acute pulmonary insufficiency or resp depression; hypotension, transient apnoea; post-op unconsciousness; epileptic patients; cardiac & resp impairment, hypovolaemic patients; fat metabolism disorders. Increased risk of relative vagal overactivity. May cause involuntary movements. Patients undergoing procedures where spontaneous movements are undesirable eg, ophth surgery. High-dose & long-term use. Monitor for early signs of hypotension, airway obstruction & O
2 desaturation. Monitor blood lipid levels. Avoid alcohol prior to & for at least 8 hr after administration. Not recommended w/ electroconvulsive treatment. Concomitant use w/ CNS depressants eg, alcohol, general anaesth, narcotic & potent analgesics; other agents causing bradycardia. May affect ability to drive & use machines. Renal or hepatic impairment. Not be used for obstet anaesth & during pregnancy. Lactation. Not indicated for ICU sedation in patients ≤16 yr. Not recommended for paed general anaesth, in childn <1 mth & neonates. Not to be used as rapid bolus inj in elderly. Debilitated patients.