That kind of doesn't make pharmacological sense. First off Phenibut acts mostly at GABA
B, not GABA
A (like benzos, etc).
Second off, you shouldn't have withdrawals with weekly use of phenibut, assuming you mean once every 7 days.
Kava has
several effects,
none of which effect GABAB:
- Potentiation of GABAA receptor activity (by kavain, dihydrokavain, methysticin, dihydromethysticin, and yangonin).
- Inhibition of the reuptake of norepinephrine (by kavain and methysticin) and possibly also of dopamine (by kavain and desmethoxyyangonin).
- Binding to the CB1 receptor (by yangonin). (This is the cannabinoid activity)
- Inhibition of voltage-gated sodium channels and voltage-gated calcium channels (by kavain and methysticin). (This causes oral numbness)
- Monoamine oxidase B reversible inhibition (by all six of the major kavalactones).
You should, in principle, be able to just stop taking kava-kava if it is small doses and not frequent usage. There are instances of
kava addictions from heavy and continuous use, presumably because it is a GABA
A activator, like benzodiazepines or others.
I would try to taper your usage slowly, or switch to just THC.
Do not start taking Valium as you will no doubt just end up with a horrible benzo dependency.