I have been taking montelukast sodium aka singular for about three months. can this medication cause dryness in the post menopausal stage of life. i have more pain from thinning of the vaginal tissue as a result of post menopause. i have been inserting 400 mg of vitamin e and that has helped to build the walls. i am unable to tolerate estrogen. i wonder if i could increase it to 800 mg of vitamin e.