Hi, Practin syrup should ideally be stored below 25-30°C. If your cupboard stays reasonably cool and away from direct sunlight, it should be fine. However, in extreme Kolkata heat without AC, temperatures inside can exceed safe storage limits and may affect the syrup's potency over time.
Before using, check for any change in colour, consistency, or smell. If it looks and smells normal, it should be safe to use.
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Feel free to consult me on Practo for any further queries.