The number of antihistamines you can take in a day depends on the specific type of antihistamine. For many common over-the-counter antihistamines like cetirizine and loratadine, the typical adult dose is 10 mg once daily. Chlorphenamine is usually taken every 4 to 6 hours with a maximum of 6 tablets or 24 mg in 24 hours. Fexofenadine doses for adults can be 120 mg once daily or up to 180 mg per day depending on the severity of symptoms. It is important not to exceed the recommended dosage to avoid serious side effects. Always follow the instructions on the medication label or consult a healthcare provider for personalized advice. Taking multiple doses or different antihistamines simultaneously can be dangerous and lead to overdoses. Here are some typical doses for adults:
- Cetirizine: 10 mg once a day
- Loratadine: 10 mg once a day
- Chlorphenamine: 4 mg every 4 to 6 hours (max 24 mg/day)
- Fexofenadine: 120 mg once daily or up to 180 mg per day
Taking more than the recommended dose or taking several antihistamines at the same time can cause side effects like extreme drowsiness, confusion, or overdose symptoms, so it should be avoided without medical supervision.
