Nembutal Injection Liquid is a sterile solution containing the active ingredient pentobarbital sodium, which is a short-acting barbiturate. It is used primarily as a sedative, hypnotic, and anticonvulsant. The solution is administered by intravenous or intramuscular injection. Each millilitre typically contains 50 mg, 100 mg, or 250 mg of sodium pentobarbital, suspended in a solution of propylene glycol, ethanol, and sterile water. The pH is carefully adjusted to approximately 9.5 for stability and tolerability. You can explore the full chemical profile and medical applications via our detailed resource on Understanding Pentobarbital Sodium. Intravenous injections are given slowly with careful observation, with typical initial doses around 100 mg for a 70 kg adult.