We suggest everyone include prescription of travel for medical and personal that might prescribe by your doctor (antibiotics, Diamox, sleep aids)
Sunscreen: SPF 30 or higher, non-oily (Dermatone or Terrapin)
Lip screen: SPF 30 or higher, any brand
Toiletry kit: toothbrush, toothpaste, lotion, alcohol-based anti-bacterial hand sanitizer, anti-bacterial soap, comb/brush, shave kit, lighter, small long-burning candle, needle/thread, throat lozenges (bring travel size bottles to keep your kit small)
First-aid kit: Ibuprofen/Aspirin, assorted band-aids, moleskin, little of hydrogen peroxide, Neosporin-type suave, Nu-skin spray, small gauze pad, a roll of adhesive tape, tweezers, safety pins, a small bottle of water purification tablets.
Zip-loc bags: Always useful Baby wipes
Earplugs: Very useful in noisy lodges and tents. Available in most hardware stores.
Water purification tablets: Such as Potable Aqua brand iodine tablets. You will be given plenty of purified water during your trek and climb, but one bottle of backup purification tablets is always a good idea for your travels.
They are especially useful in hotels on your way to Nepal. You should not drink untreated tap water anywhere in Asia and bottled water in some rare cases might not be available.