Refer to your pharmacist anyone who:
- Has never suffered from hayfever before
- Is pregnant or breastfeeding
- Is taking other medication
- Is asthmatic
- Is trying OTC treatments unsuccessfully or is suffering unacceptable side-effects
- Reports wheezing, breathlessness or a feeling of tightness in the chest
- Complains of sinus or headache pain, and/or a yellow or green nasal discharge. This could be a sign of a sinus infection
- Has a fever.