Safety of antihistamines during pregnancy and lactation. Can Fam Physician. Cleveland Clinic. July 13, Pharmacology of antihistamines. World Allergy Organization Journal. Approved February 25, Approved November 27, Approved September 3, Your Privacy Rights. To change or withdraw your consent choices for VerywellHealth. At any time, you can update your settings through the "EU Privacy" link at the bottom of any page. These choices will be signaled globally to our partners and will not affect browsing data.
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Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. Gonzalez-Estrada, A. This can be harmful or prevent the drug from working well. Allegra and Claritin interact with some of the same drugs. Specifically, each may interact with ketoconazole and erythromycin. But Allegra can also interact with antacids , and Claritin can also interact with amiodarone.
To help avoid interactions, be sure to tell your doctor about all prescription and OTC drugs, herbs, and supplements you take. They can tell you about what interactions you might be at risk of in using Allegra or Claritin. For example, both Allegra and Claritin can cause problems if you have kidney disease.
And certain forms may be dangerous if you have a condition called phenylketonuria. These forms include the orally disintegrating tablets of Allegra and the chewable tablets of Claritin. If you have either of these conditions, talk to your doctor before taking Allegra or Claritin.
You should also talk to your doctor about the safety of Claritin if you have liver disease. Both Claritin and Allegra work well to treat allergies. The main differences between these two medications include their:. Before taking either medication, talk to your doctor or pharmacist. Mayo Clinic offers more ways to reduce your exposure to allergens : Avoid yard chores that stir up dust, debris, and pollen.
Ask someone to do your yard work and other chores during peak pollen season. If you must work outdoors, wear a mask. Keep the windows to your house closed on high pollen days. Also close your car windows to avoid excess pollen. Keep your windows closed during pollen season.
Remove clothes and immediately shower after going outdoors. Wash your hair and skin to remove all pollen. Stay inside on dry, windy days. Wait until a good rain has cleared the pollen and dust from the air before you go outside.
Shower Immediately After Being Outside. Skip Having a Drink With Dinner. Put the Humidifier Away. Fexofenadine is classed as a non-drowsy antihistamine, but some people still find it makes them feel quite sleepy. Common side effects include headaches, feeling sleepy, dry mouth, feeling sick and dizziness. Do not drink grapefruit juice, apple juice or orange juice while you're taking fexofenadine.
It might make you more likely to get side effects. Adults and children aged 6 years and over can take fexofenadine tablets. To make sure it's safe for you, tell your doctor or pharmacist before taking fexofenadine if you: have ever had an allergic reaction to fexofenadine or any other medicine have problems with your liver or kidneys have, or have ever had, heart problems have epilepsy or another health condition that puts you at risk of seizures or fits are due to have an allergy test — taking fexofenadine may affect the results, so you might need to stop taking it a few days before the test.
Dosage Fexofenadine comes as tablets in different strengths: 30mg, mg and mg. How much you take depends on why you're taking it. The usual dose for treating hay fever is: mg once a day for adults and children aged 12 years and over 30mg twice a day for children aged 6 to 11 years, with the doses spaced 10 to 12 hours apart The usual dose for treating hives is mg once a day for adults and children aged 12 years and over.
Fexofenadine is not recommended for treating hives in children under How to take it If you're taking 30mg fexofenadine tablets, you can take them with or without food. When to take it Try to take fexofenadine tablets at about the same time every day.
What if I forget to take it? Do not take 2 doses to make up for a forgotten dose. What if I take too much? Common side effects Common side effects of fexofenadine happen in more than 1 in people.
Talk to your doctor or pharmacist if these side effects bother you or do not go away: feeling sick nausea feeling sleepy headaches dry mouth feeling dizzy Serious side effects It's rare to have a serious side effect with fexofenadine. Urgent advice: Contact for advice now if:. Serious allergic reaction In rare cases, fexofenadine may cause a serious allergic reaction anaphylaxis.
Information: You can report any suspected side effect using the Yellow Card safety scheme. Visit Yellow Card for further information.
What to do about: feeling sick — stick to simple meals and do not eat rich or spicy food. If this does not help, talk to your doctor. It's best not to drink alcohol. Take an everyday painkiller like paracetamol or ibuprofen.
Move slowly and carefully. Avoid coffee, cigarettes, alcohol and recreational drugs. If the dizzy feeling does not get better within a couple of days, speak to your pharmacist or doctor. Fexofenadine and pregnancy Fexofenadine is not usually recommended if you're pregnant as there is not a lot of information about its use in pregnancy. Fexofenadine and breastfeeding If your doctor or health visitor says your baby is healthy, you can take fexofenadine while breastfeeding.
Non-urgent advice: Tell your doctor if you're:. Check with your pharmacist or doctor if you're taking: ketoconazole , a medicine to treat fungal infections dronedarone, a medicine used in people who have had cardioversion to control their heart rate erythromycin , an antibiotic filgotinib or leflunomide, medicines to treat arthritis letermovir, a medicine used in people who have had a stem cell transplant pibrentasvir or velpatasvir, medicines to treat hepatitis C infection rifampicin, an antibiotic teriflunomide, a medicine to treat multiple sclerosis indigestion remedies containing aluminium or magnesium — leave about 2 hours between taking fexofenadine and taking your indigestion remedy medicines to treat cancer any medicine that makes you drowsy, gives you a dry mouth, or makes it difficult for you to pee — taking fexofenadine might make these side effects worse Mixing fexofenadine with herbal remedies and supplements There's very little information about taking herbal remedies and supplements with fexofendadine.
Ask your pharmacist for advice. Important: Medicine safety Tell your doctor or pharmacist if you're taking any other medicines, including herbal medicines, vitamins or supplements. How does fexofenadine work? Fexofenadine blocks the effects of histamine and reduces these symptoms. When will I feel better? You should start to feel better within 1 to 2 hours. How long should I take fexofenadine for?
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