allergic rhinitis
"I have been taking Zyrtec for almost 6 years. I was first prescribed Zyrtec to combat my allergies during pregnancy. It worked well except to make me a little drowsy. I only take it seasonally, and it still works well for my symptoms, but the fatigue and drowsiness has gotten worse over time. When I started taking it again for my Spring/Summer allergies this year, the first week was horrible. Even taking it at night I felt so fatigued the next day my muscles ached, and I had to fight to stay awake during the day with my 2 little ones at home. I would fall asleep as soon as my husband got home and sleep 14-15 hours. After about a week my body seemed to adjust and the drowsiness isn't as bad anymore."