Antihistamines work by having a calming effect on the brain, helping you to feel less anxious.
Antihistamines that can cause weight gain include: Diphenhydramine (Benadryl and others) Cetirizine (Zyrtec)
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.
Zyrtec has a quicker onset of action compared to Claritin and may be more effective than Claritin in reducing allergy symptoms, according to one clinical trial. However, cetirizine, the active ingredient of Zyrtec, has been shown to produce more drowsiness than loratadine.
Four small studies suggest that cetirizine 20 mg daily may improve symptoms in adults with severe chronic urticaria. In Okubo et al (2013), itching and weals improved in people who took cetirizine 20 mg daily or olopatadine 5 mg twice daily as a dose increase from cetirizine 10 mg.
Long-term use of Benadryl, an over-the-counter allergy medication, has been linked to an increased dementia risk. In lieu of Benadryl, possible alternatives include cetirizine (Zyrtec), fexofenadine (Allegra) and loratadine (Claritin).
In fact, current European guidelines recommend up to four times the usual recommended dose of antihistamine in patients who symptoms persist with standard therapy [12]. For example, doses of up to 40 mg of cetirizine, 20 mg of desloratadine, and 480 mg of fexofenadine may be used in adults.
Zyrtec contains pseudoephedrine, the same ingredient in Sudafed that has caused controversy and concern over illicit use - but not in its own right. The compound can cause drowsiness and can be used in the making of methamphetamine. But pseudoephedrine doesn't itself have an addictive chemical profile.
The usual dosage for adults younger than 65 years and children who are 6 years and older is one 10-milligram (mg) dose per day. You shouldn't take more than 10 mg in 24 hours. Your doctor may recommend a 5-mg dose once or twice per day if your allergies are mild.
However, antihistamines can lose their effectiveness in just three weeks of daily use, so you may have to find another solution if your symptoms last long enough.
Weaning off the antihistamine by reducing the dosage gradually. Firm bristle brush for scratching (this will help cut down on bruising caused by your fingers) and for improved drainage of the lymphatic system. Low histamine diet. Hot showers (but be sure to moisturize well after!)
Avoid use of alcohol, sedatives, and tranquilizers as cetirizine can increased the risk of drowsiness. Cetirizine may cause central nervous system depression; avoid activities requiring mental alertness until accustomed to medication.
If your allergy is particularly bad then yes you can take them on the same day, as there are no known interactions. 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.
Although palpitations may be caused by a heart problem, they also occur because of stress, fatigue, or use of alcohol, caffeine, or nicotine. Many medicines, including diet pills, antihistamines, decongestants, and some herbal products, can cause heart palpitations. Nearly everyone has palpitations from time to time.
Common side effects of Zyrtec include:
- drowsiness,
- fatigue,
- tired feeling,
- dizziness,
- dry mouth,
- sore throat,
- cough,
- nausea,
Question: If someone is using a nasal steroid spray, such as Nasonex or Flonase, is it okay or even desirable to also use an oral antihistamine such as Zyrtec or Claritin? Answer: Yes, both antihistamines and nasal steroids can be used, depending on the clinical symptoms and the response to treatment.
For allergy sufferers with heart disease, medicines such as Allegra, Zyrtec or Claritin should be safe. However, medicines containing decongestants — including Allegra-D, Zyrtec-D and Claritin-D — could increase your blood pressure and heart rate or interfere with your heart medication.
Do NOT "double-up" on a dose. Do NOT take a dose sooner than you're supposed to. Do NOT take two different antihistamines at the same time. Instead, talk to your doctor or pharmacist if you have trouble finding a drug that works well for your allergy symptoms.
So taking your 24-hour allergy medications before going to bed means that you'll get the maximum effect when you need it the most. "Taking your allergy medication at night assures that it will be circulating in your blood stream when you most need it, early the next morning," Martin says in a news release.
Dosage
| adults and children 6 years and over | 1 tablet daily; not more than 1 tablet in 24 hours |
|---|
| children under 6 years of age | ask a doctor |
| consumers with liver or kidney disease | ask a doctor |
Our Top Picks
- Allegra Adult 24-Hour Allergy Relief at Amazon.
- Children's Zyrtec Allergy Relief Syrup at Walmart.
- Claritin 24-Hour Allergy Reditabs at Amazon.
- Xyzal Allergy Relief Tablets at Walmart.
- Zyrtec Prescription-Strength Allergy at Amazon.
- Benadryl Ultratabs Antihistamine at Amazon.
The 4 Best Natural Antihistamines
- Antihistamines.
- Stinging nettle.
- Quercetin.
- Bromelain.
- Butterbur.
- Takeaway.
