I was initially prescribed 2.5mg bd. 11 weeks later this was increased to 5mg bd, yesterday. How long did it originally take to start working & how long will it take 4 the increase to start working? What's the long-winded definition of oxybutynin? eg. fluphenazine is 2-{4-[3-(2-trifluoromethylphenothiazin-10-yl)propyl]piperazin-1-yl}ethanol?