Sally
I am glad it is helping you and I suggest you resist attempts to make you lower the dose at this stage
Some doctors still do prescribe Plaquenil like this but as far as I can see not those experienced in treating lupus. I also get the impression that in general UK doctors tend to be more conservative.
Experts such as Dr Wallace advise using it for a couple of years then gradually decreasing. So many people are on Plaquenil at the maximum recommmended dose for their ideal weight for years and years that is lifelong in effect that it is hard to see what the rationale for such short term treatment might be.
Sometimes people are put on unusually high doses for a few weeks eg 600mgs to give a kick start but then it is reduced because dosage is cumulative over the years so in theory the lower the dosage the less risk of eye toxicity and the longer it can be taken.
I was dosed rather like this over 30 years ago !!! a bit like Prednisone taking a high dose for a few weeks then gradually reducing over a couple of months. I have read umpteen accounts here of people being made to reduce after a few months and soon feeling much worse. They are then stuck for the next few months before they can see their consultant again. ( For US readers a 'consultant' is a specialist ) It wasn't until I was put on 400mgs a day about 15 years ago that I experienced a remarkably obvious benefit.
I asked the distinguished panel including Dr Hughes at a LupusUK conference one year why Plaquenil dosage should be reduced like this after a few months given the numerous remarkable benefits that Plaquenil brings. They couldn't give any justification or explanation, just the unconvincing comment " different prescribing habits "
I suggest that you tell him you would like to stay on 400mgs for a year then try reducing gradually to see how you get on. You can tell him it is doing so much good already that you are very reluctant at this stage not to get the full benefit. If he insists

() then ask him at least to leave the decision to you . That is you want to be able to up the dose if your symptoms worsen.
Gosh, they are funny where you live
By the way the maximum recommended dose is 6.5mgs per kilo or about 3 mgs per lb or 42 mgs per stone
ideal body weight. An ideal body weight of 8 stone/ 113 lbs would give a recommended maximum of 336 mgs. Since the pills come only in 200mgs, it makes more sense to adjust how many you take each day over say, a week or eight days rather than fuss about splitting them. Taking two one day and one the next would give an average of 300mgs a day. Taking 400mgs for 3 days and one the next would give 350mgs a day average unless I can't do sums now.
Good Luck with the silly fellow. If you want a list of all the beneficial actions & properties of Plaquenil to wave in his face, just let me know!

Clare