That is only 900mg/day.
Most do not see any help until at least 1800mg/day
in 3 or 4 evenly divided doses. Your doc is being extremely conservative.
Possibly because of prior reactions & s/e.
It takes about an hour or so to start working after taking it.
It must work 24/7 in the body to be effective, not taken as a flare-up or emergency- medication.