How long does it take for Cetirizine to take effect?

Claritin refers to loratadine tablets. Generally, most people will start to feel the effects within 1–3 hours after taking loratadine orally, although the onset time may vary depending on individual differences and the severity of allergic symptoms. If in doubt, it is recommended to consult a doctor in advance. Detailed analysis is as follows:

For individuals with mild allergy symptoms and normal metabolic function, effects can typically be felt within 1–2 hours after taking the medication. The drug is rapidly absorbed through the gastrointestinal tract, quickly blocking histamine receptors and relieving discomfort such as skin itching, sneezing, and runny nose. In these cases, the onset is steady and effectively alleviates daily disturbances caused by mild allergies.

If allergy symptoms are severe, or if there are issues such as impaired liver or kidney function or slow metabolism, the onset time may extend to 2–3 hours. During severe allergic reactions, histamine levels in the body are higher, requiring the drug to reach a certain blood concentration before becoming effective. Metabolic abnormalities can delay both absorption and onset of action. Some individuals may need to take the medication continuously for 1–2 days to achieve optimal symptom relief.

Loratadine tablets should be taken strictly according to the dosage instructions on the label or as directed by a physician; do not increase the dose on your own. If symptoms do not improve or worsen after taking the medication, seek medical attention promptly to adjust the treatment plan. Avoid alcohol during treatment, and stay away from allergens to enhance the drug's effectiveness.