How long does Kaihoujian spray remain effective after opening?

Nov 06, 2025 Source: Cainiu Health

Dr. Lu Cheng

Introduction

Kaihoujian Spray typically expires within 1 month after opening. Single-dose packages should be used immediately upon opening, and any remaining solution must be discarded. Multi-dose packages are prone to contamination and evaporation due to air exposure; therefore, they should not be used beyond 1 month even if still within the labeled expiration period. If throat discomfort worsens after using an expired spray, prompt medical attention is recommended.

After opening, Kailoujian spray typically expires within 1 month. Single-dose packages should be used immediately after opening, and any remaining medication must be discarded. Multi-dose packages are prone to contamination and evaporation of active ingredients due to exposure to air; therefore, they should not be used beyond 1 month even if still within the labeled expiration period. If throat discomfort worsens after using an expired spray, prompt medical attention is recommended.

Kailoujian spray contains herbal ingredients. After opening, repeated contact between the nozzle and the mouth increases the risk of bacterial contamination. Prolonged exposure of the liquid to air may lead to oxidation, degradation of active components, and reduced efficacy. In addition, frequent opening compromises the package's seal, potentially causing moisture absorption or evaporation of the solution, further shortening its usable life.

It should be noted that packaging designs of Kailoujian sprays may vary by brand, and some product instructions explicitly indicate the usable period after opening. Users should always follow the manufacturer's instructions first. If the solution changes color, becomes cloudy, develops an unusual odor, or if the nozzle becomes clogged—even within 1 month of opening—use should be discontinued immediately to avoid throat irritation or infection.

For daily storage, keep Kailoujian spray away from direct sunlight and high temperatures. Always tightly cap the nozzle after each use and store it out of reach of children. Cleaning the nozzle before use helps maintain hygiene and prevents premature deterioration due to improper storage.

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Can Kaitongjian spray be swallowed?

In general, Kaihoujian spray is not recommended to be swallowed. The medication should be used as directed by a physician. When using Kaihoujian spray, follow the instructions in the package insert or your doctor's advice to control the dosage and avoid excessive spraying. After spraying the medication, try not to drink water or eat immediately, allowing the medicine to remain in the throat for a period of time to ensure its effectiveness. If allergic reactions such as rash or itching occur after spraying, discontinue use and consult a healthcare professional.

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Which is better between Kehoujian Spray and Xigua Frost?

Kaihousword Spray and Watermelon Frost do not have an absolute "better" choice. When the throat experiences acute swelling and pain, obvious burning sensation, or is accompanied by initial redness and pain of oral ulcers, Kaihousword Spray has a more direct effect in reducing swelling and relieving pain, providing rapid relief of local discomfort, especially suitable for use during the acute phase of throat inflammation. Its spray formulation can act directly on the affected area and tends to take effect relatively quickly.