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For Alzheimer's disease melatonin can been taken in doses of 1-10 milligrams daily, and in Parkinson's disease, doses of 3-50 milligrams can be taken by mouth nightly before bed. However the exact dosage that is beneficial for him can only be determined by his doctor. Therefore though it is OK and safe for you to increase the dosage to 6 mg, still you must do this only after informing his primary care doctor. His doctor should be aware of all the medications and supplements that he is taking.
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