both of those products contain antihistamines which treat allergy symptoms. claritin liquid gels should last for 24 hours. so if you are finding you need more medication at night they may not be working for you. i would need to know more about your symptoms and how you are feeling in order to suggest the best way to treat them. i suggest you discuss the issue with your health-care professional.
for my allergies can i take claritin liquid gels during the day and tylenol severe allergy at night?