Pregabalin is best known as a nerve-pain medicine, but in the UK and across Europe it has been licensed for generalised anxiety disorder (GAD) since 2006. In the US it never received that indication, which is why American readers often hear it described only as a pain or seizure drug. The research is the same everywhere; what differs is which regulator was asked.
What the trials found
Across more than a dozen randomised trials in GAD, pregabalin at 150–600 mg a day reduced anxiety scores more than placebo, with an effect size similar to the SSRIs and SNRIs that are the usual first-line choice, and similar to benzodiazepines such as lorazepam. Two things stood out: it worked quickly — improvement within the first week, rather than the four to six weeks typical of antidepressants — and it helped both the psychological symptoms (worry, tension) and the physical ones (muscle tension, restlessness, poor sleep).
Where it fits
UK guidance (NICE) lists pregabalin as an option for GAD when an SSRI or SNRI isn't tolerated or hasn't worked. It's also used alongside an antidepressant, and for people with both nerve pain and anxiety, where one medicine covers both. It isn't recommended for panic disorder or social anxiety on its own; the evidence there is thinner.
Doses used in the studies
Trials used 150 mg to 600 mg a day, split into two or three doses, with 300–450 mg a day the most common effective range. Prescribers usually start at 75 mg twice daily and increase weekly. As with pain, benefit at low doses doesn't always predict what's needed long-term.
What to watch for
- Drowsiness and dizziness, especially in the first two weeks. Don't drive until you know how you respond.
- Weight gain — a few kilograms over months is common.
- Dependence and misuse. Pregabalin produces a mild euphoria in some people, and misuse — mostly alongside opioids or alcohol — is why the UK made it a controlled drug in 2019. Take it as prescribed and don't combine it with other sedatives.
- Withdrawal if stopped abruptly: insomnia, headache, nausea, rebound anxiety. Taper over at least a week.
- Mood changes. Any new or worsening low mood or thoughts of self-harm need a prompt conversation with a doctor.
Bottom line
For GAD, pregabalin is a reasonable, evidence-based second-line option with a fast onset, and a first-line one for people who also have neuropathic pain. It's a prescription decision, not a self-treatment one: the right dose, the right duration and the plan for coming off it all need a prescriber.
General information, not medical advice. If you're in crisis, contact your local emergency services or a crisis line.