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You may take the drugs as advised by your Doctor although too much of Vitamin E
can have bad effect as well. This is standard dose. Don't take it for long time as it can be more in your body as it is fat soluble vitamin. Back and knee pain
is mainly due to strain of growing uterus on spine and nerves. You can do mild stretching exercises under medical advice
from your doctor. Eat fibre rich food like fresh green leafy vegetables and fruits to prevent constipation
which can also cause back pain.