With Natural Senna For gentle, dependable overnight relief of occasional constipation (irregularity). Ex-Lax offers a money back guarantee: If taken at bedtime, Ex-Lax is guaranteed to work gently, effectively by 8 AM or your money back. Ative Ingredient: Sennosides, USP, 25mg Directions: Adults and children 12 years of age and older take 2 pills once or twice daily with a glass of water. Children 6 to 12 years old take 1 pill once or twice daily with a glass of water. Children under 6 years of age, consult a doctor.