2000 mg amoxicillin a day. . (2000 mg. . . . effects were seen in rats given amoxicillin (with clavulanic acid) at maximum doses of 400 mg and 1,200 mg per day prior to . . . . . 500 mg orally 3 times a day or 875 mg orally twice a day . . . . . but I'm taking 2,000 mg a day. / 500 mg. . My son is about 95 lbs. I started amoxicillin two weeks ago and ever since I have had an insane sense of . . My drug book says 20-40 mg/kg of . . varied 500mg to 1 Gram up to three times a day. com. . but in m... more