F-Phenibut
People mainly take F-Phenibut for anxiety. Based on 4 first-hand reports and 0 meta-analyses & systematic reviews in the medical literature. Ranked #439 of 1,974 overall.
Of reports that state an outcome, 100% are positive.
What F-Phenibut does, according to users
Of the people who reported each effect, the share who said it got better.
What the research says
Systematic reviews and meta-analyses from PubMed, with their published conclusions.
No randomized controlled trials in humans found on PubMed. The grade measures how much human research exists — read the conclusions below for what it found.
Dosage people report
As stated by users — not a recommendation. Follow the label or your doctor.
Reported side effects
How often each side effect came up across all reports.
What users say
Verbatim quotes, shortened only — each links to the original discussion.
“F-Phenibut seems to take effect very quickly (within 5 - 10 minutes)...I felt a tingling sensation in my scalp, and a feeling of calmness/contentedness come over me.”
“next batch of experimental stuff like PRL-5-53, NSI-189, F-Phenibut, PPAP”
“noopept, 5-htp, f-phenibut, adrafinil, bromantane and some other drugs will become controlled substances”
Other options for anxiety
User data from public discussions; research from PubMed. Information only, not medical advice — talk to a doctor before starting, stopping or combining anything. Data updated October 2, 2026. How we rate