If it's supposed to be refrigerated and it's left outside for too long, it will start losing its potency. Each brand is different as they use different preservatives, there's usually no specific number for when it goes bad or not. I would check the package insert that came with the eye solution bottle for the best answer.
- Phenylephrine Information for Consumers
- Phenylephrine Information for Healthcare Professionals (includes dosage details)
- Side Effects of Phenylephrine (detailed)
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