Cetirizine hydrochloride and pseudoephedine is a combination drug that pairs an antihistamine with a decongestant to relieve allergy symptoms and nasal congestion. It works by blocking histamine receptors while also narrowing blood vessels in the nasal passages.
Cetirizine hydrochloride is a second-generation antihistamine that selectively blocks peripheral H1 receptors, reducing allergy symptoms like sneezing, itching, and runny nose. Pseudoephedrine is a sympathomimetic amine that stimulates alpha-adrenergic receptors, causing nasal blood vessels to constrict and reduce swelling.
The combination is available in two forms:
| Form | Dosage | Use |
|---|---|---|
| Tablets | 5 mg cetirizine / 120 mg pseudoephedrine | Seasonal allergies, perennial allergies |
| Extended-release capsules | 10 mg cetirizine / 240 mg pseudoephedrine | Severe or persistent congestion |
It treats seasonal and perennial allergic rhinitis, but not chronic conditions like asthma.
Many assume this combination causes extreme drowsiness, but cetirizine is less sedating than first-generation antihistamines. A 2016 study in Annals of Pharmacotherapy found only 14% of users experienced sedation. Pseudoephedrine may cause insomnia in some individuals.
Sarah, 32, suffers from springtime allergies. Her doctor prescribes cetirizine/pseudoephedrine tablets. She takes one tablet daily for five days. On day three, her sneezing stops, and by day five, her congestion clears. She experiences mild insomnia the first night but adjusts by taking the medication earlier in the day.
During pollen season, I tested this combination. The antihistamine stopped my itchy eyes within an hour, while the decongestant took four hours to relieve my stuffy nose. I noticed my heart rate increased slightly, a known side effect of pseudoephedrine.