As they are both nasal decongestants I would be cautious about trying phenylephrine.
Was your allergy to pseudoephedrine serious... if it wasn't you could try taking a very small dose of phenylephrine to see how your body reacts.
- Phenylephrine Information for Consumers
- Phenylephrine Information for Healthcare Professionals (includes dosage details)
- Side Effects of Phenylephrine (detailed)
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