Pregabalin, marketed under the brand name Lyrica among others, is a medication used to treat epilepsy, neuropathic pain, fibromyalgia, restless leg syndrome, and generalized anxiety disorder. Its use in epilepsy is as an add-on therapy for partial seizures. When used before surgery, it reduces pain but results in greater sedation and visual disturbances. It is taken by mouth.Common side effects include headache, dizziness, sleepiness, confusion, trouble with memory, poor coordination, dry mouth, problem with vision, and weight gain.  Serious side effects may include angioedema, drug misuse, and an increased suicide risk. When pregabalin is taken at high doses over a long period of time, addiction may occur, but if taken at usual doses the risk is low.[1] Use during pregnancy or breastfeeding is of unclear safety. Pregabalin is a gabapentinoid and acts by inhibiting certain calcium channels. Pregabalin was approved for medical use in the United States in 2004. It was developed as a successor to gabapentin.  It is available as a generic medication in a number of countries, including the United States as of 2019 . In the US the wholesale cost is about US$11 per month as of October 2019. While in the United Kingdom a similar dose costs the NHS about £6 as of 2018. In 2017, it was the 72nd most prescribed medication in the United States with more than 11 million prescriptions.  In the US, Pregabalin is a Schedule V controlled substance under the Controlled Substances Act of 1970.  It is a Class C controlled substance in the UK. Pregabalin is generally not regarded as efficacious in the treatment of acute pain. In trials examining the utility of pregabalin for the treatment of acute post-surgical pain, no effect on overall pain levels was observed, but people did require less morphine and had fewer opioid-related side effects. Several possible mechanisms for pain improvement have been discussed.