Powder form of Nembutal available in Our Nembutal Store is of high quality and will lead to an easy and peaceful death soon(without any pain)Buy Nembutal Pentobarbital Powder Online in the following concentrations: 12 grams, 15 grams, 50 grams, 100 grams, Nembutal (Pentobarbital sodium) is used short term to treat insomnia. It is also used as an emergency treatment for seizures, and to cause patients to fall asleep for surgery. This medication of powder is available in ITS generic form. In case of patients who want to take it for treating insomnia or other related problems, the use should be restricted as per requirement. Dosage of the Nembutal(barbiturates) must be individualized with knowledge of patient’s medical condition and recommended rate of administration. Nembutal Powder Warnings. Barbiturate(Nembutal) can cause foetal damage to a pregnant women.