USP Xanthanoic Acid RS (C14H10O3 226.23) —Dry portion at 105 for 4 hours before using. Keep container tightly closed.

USP Xanthone RS (C13H8O2 196.21) —Do not dry. Keep container tightly closed.

USP Xylazine RS— Dry portion at 60 in vacuum for 4 hours before using. Keep container tightly closed.

USP Xylazine Hydrochloride RS— Dry portion at 105 for 4 hours before using. Keep container tightly closed.

USP Xylitol RS— Do not dry. Determine the water content titrimetrically at the time of use. Keep container tightly closed.

USP Xylometazoline Hydrochloride RS— Dry portion at 105 for 4 hours before using. Keep container tightly closed. Protect from light.

USP Xylose RS— Dry portion in vacuum at 60 to constant weight before using. Keep container tightly closed.