Zyrtec Tablets official prescribing information for healthcare professionals. Includes: indications, dosage, adverse reactions, pharmacology and more. My 10 month old daughter has suffered from nasal congestion and a runny nose for most of her 10 months. She also occasionally breaks out in sporadic little red bumps. Learn about overdosage and contraindications for the drug Zyrtec (Cetirizine). Find powerful relief from allergy symptoms that starts working at hour one with, 24-hour Zyrtec® Liquid Gels. My 2 year old daughter is taking Zyrtec on a daily basis. She has a rare disease called Mastocytosis and is subject to anaphylaxis for unknown reasons. The treatment of hives includes antihistamines which may be necessary for prolonged periods (in excess of 6 weeks).They include cetirizine or Loratadine Sedating. Learn about warnings and precautions for the drug Zyrtec (Cetirizine). Below are Zyrtec (Cetirizine) reviews, ratings, comments submitted by patients and caregivers. Based on a total of 32 ratings/reviews, Zyrtec has an overall score of 7.78 The proven allergy relief of ZYRTEC® plus a powerful decongestant. Find it behind the pharmacy counter. No prescription needed.* *In most states. Histamine is an important mediator of immediate hypersensitivity reactions acting locally and causing smooth muscle contraction, vasodilation, increased.