American Association of Clinical Endocrinologists, American Diabetes Association,
41 Answers 1,794 Helpful Votes 31 Followers
Cetirizine (Zyrtec) is an antihistamine that is used for allergies. It is available over the counter. The maximum recommended dose of Zyrtec is 10mg per day. Studies have been done in people with chronic hives comparing the 10 mg to the 20 mg dose of Zyrtec and no advantage was seen with the higher dose. The recommended dose of Zyrtec is not based on weight and height.
Whenever you take a higher than recommended dose of a medication you increase your risk of side effects. Although Zyrtec is available over the counter that doesn’t mean it is harmless. Zyrtec can cause sleepiness and this effect is increased when Zyrtec is combined with alcohol or other drugs that cause sedation. Zyrtec use has also been associated with liver damage in rare individuals.
Play it safe and stick with the recommended dose. Talk with your doctor about using Zyrtec and whether the benefits of increasing the dose outweigh the risks.
I am a conservative medical provider, so I rarely, if ever, push the recommended dosages on Zyrtec or any drug. These things are carefully studied during the clinical trials so taking two may not be considered toxic or dangerous for a short period of time (even for a big guy), but this dose is not recommended. Like many drugs, this one is excreted by your kidneys, so why push the limit?
If this or any drug is not controlling allergy symptoms, it may be better to try something else. There are many ways to treat allergies than exceeding recommended dosages. Talk to your medical provider, but I bet he or she will not endorse your double dosage.
Important: The opinions expressed in WebMD User-generated content areas like communities, reviews, ratings, blogs, or WebMD Answers are solely those of the User, who may or may not have medical or scientific training. These opinions do not represent the opinions of WebMD. User-generated content areas are not reviewed by a WebMD physician or any member of the WebMD editorial staff for accuracy, balance, objectivity, or any other reason except for compliance with our Terms and Conditions. Some of these opinions may contain information about treatments or uses of drug products that have not been approved by the U.S. Food and Drug Administration. WebMD does not endorse any specific product, service, or treatment. Do not consider WebMD User-generated content as medical advice. Never delay or disregard seeking professional medical advice from your doctor or other qualified healthcare provider because of something you have read on WebMD. You should always speak with your doctor before you start, stop, or change any prescribed part of your care plan or treatment. WebMD understands that reading individual, real-life experiences can be a helpful resource, but it is never a substitute for professional medical advice, diagnosis, or treatment from a qualified health care provider. If you think you may have a medical emergency, call your doctor or dial 911 immediately.