Hexilak Gel Price In Pakistan Hexilak Gel can rarely show some side effects like burning or tingling sensation at the site of application, skin irritation, etc. These side effects usually subside on their own. Consult your doctor if they bother you for a long time or become severe. How should I use Hexilak Gel Hexilak Gel should be applied to the affected area in a thin layer, 2-3 times a day, or as directed by your doctor. It should be used regularly for the prescribed duration to achieve maximum benefits.