Try to leave 10 to 12 hours between doses. So, one first thing in the morning, and one before bedtime. For children between 2 to 5 years of age, the dose is 2.5mg, twice a day. For children between 1 to 2 years of age, your doctor will use their weight or age to work out the right dose.
take 1 tablet every 12 hours; do not take more than 2 tablets in 24 hours.
For relief of symptoms from seasonal or yearly allergies: Adults and children 12 years of age and older—Take one tablet two times a day with or without food. Children 4 to 12 years of age—Use and dose must be determined by your doctor. Children and infants up to 4 years of age—Use is not recommended .
Product Overview. Each antihistamine tablet contains 10 mg Cetirizine HCl to relieve your worst allergy symptoms, indoors and out, for a full 24 hours.
ZYRTEC® is an over-the-counter medicine that provides effective, 24-hour relief of indoor and outdoor allergy symptoms.
Taking more than the usual dose is unlikely to harm you or your child. If you take an extra dose, you might get some of the common side effects. If this happens or you're concerned, contact your doctor.
take 1 tablet every 12 hours; do not take more than 2 tablets in 24 hours.
If a healthy adult takes only a slightly higher dose of antihistamine, such as accidentally taking two pills instead of one, their symptoms may not be serious, or they may not have any symptoms. However, a larger overdose, especially in children or older adults, may cause serious symptoms.
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This is a therapeutic duplication and it is usually recommended to take only one antihistamine at any time, however if you have been prescribed to take both together then it is appropriate. If you do experience any odd symptoms please see your doctor.
Why do antihistamines stop working? Antihistamines can stop working because your allergies might be getting worse or you might have immune system changes due to aging. You also might not be taking the medication as directed. If you take an antihistamine after being exposed to an allergy trigger, it won't work as well.
ZYRTEC 10 mg film-coated tablets
The maximum recommended daily dose is 20 mg, do not exceed this dose, unless told to do so by your doctor.
Even if you're severely suffering from allergies, with incredibly watery eyes or a scratchy throat, it's not recommended to take more than the daily dosage as there can be side effects that occur.
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The elimination half-life of Zyrtec is between 8 to 9 hours. It takes approximately 5.5 x elimination half-life for a medicine to be cleared from your system. For Zyrtec this is 5.5 x 9 hours which is about 2 days.
The Risks of Taking Too Much Allergy Medication
However, taking too much of any medication can be dangerous. If you accidentally take two allergy pills, you may experience side effects such as: Dizziness. Drowsiness.
For oral dosage form (tablets): Adults—1 to 2 milligrams (mg) every eight to twelve hours as needed. Children 12 years of age and older—0.5 mg to 1 mg two times a day as needed.
While most anticholinergics can be modified or monitored when taken with loratadine or cetirizine, several should be avoided entirely, including aclidinium, cimetropium, glycopyrrolate, glycopyrronium, ipratropium, oxatomide, tiotropium, and umeclidinium.
Many allergy medications, such as Zyrtec, are recommended every 24 hours. By taking the medication before bedtime you're more likely to get through the night without the active ingredients wearing off or becoming less effective closer to the end of the 24 hour period.
Sandoz issued a voluntary recall of 1,023,430 units of Zyrtec (10 mg) capsules as a result of failed impurities and a specification being reported for impurity at the 21-month stability time point, according to an FDA Enforcement Report.
Antihistamines, mainly used to treat symptoms of hay fever or other allergies, can induce drowsiness by working against a chemical produced by the central nervous system (histamine). These medications can be useful in certain situations, such as for treating sleeplessness related to travel.
Taking 10mg of Zyrtec is more effective than taking 5mg; taking 20mg appears not to provide any additional effect.
In overdose symptoms can include dizziness, tachycardia, headache drowsiness or agitation. While the current generation of lesser sedating antihistamines do not affect the QT interval at normal doses (unlike the previous generation of medicines), there are concerns there may be some effect in overdose.
"I would strongly recommend instead of taking a second antihistamine, you actually take a different medication like a steroid nasal spray," Sweet said. That's like taking a Claritin to start your day, plus a shot of Flonase in your nose if your symptoms persist. Saline solution is another nasal spray to try.
Antihistamines like diphenhydramine (Benadryl) and cetirizine (Zyrtec) aren't known to raise blood pressure when used alone. Antihistamines are part of many combination over-the-counter (OTC) cough and cold products. They may be combined with a medication that can raise your blood pressure.
Claritin and Zyrtec are effective and safe for most people with minor allergies.