<unk>  <unk>  is a psychoactive drug of the phenylpiperazine class. It was initially developed in the late-1970s and used in scientific research before being sold as a designer drug in the mid-2000s. It has been detected in pills touted as legal alternatives to illicit stimulants in New Zealand and pills sold as "ecstasy" in Europe and the United States. Despite its advertisement as a recreational substance,<unk>  is actually generally considered to be an unpleasant experience and is not desired by drug users. It lacks any reinforcing effects, but has "psychostimulant, anxiety-provoking, and hallucinogenic effects." It is also known to produce dysphoric, depressive, and anxiogenic effects in rodents and humans, and can induce panic attacks in individuals susceptible to them. It also worsens obsessive–compulsive symptoms in people with the disorder.<unk>  is known to induce headaches in humans and has been used for testing potential antimigraine medications. It has potent anorectic effects and has encouraged the development of selective 5-HT2C receptor agonists for the treatment of obesity as well.
Meta-Chlorophenylpiperazine
Para-Methoxyphenylpiperazine
Para-Iodoamphetamine
Methylpiperidinopyrazole
Methylbenzylpiperazine
Quazinone
Benzylpiperazine
Bromazine