- Subjects who are unable to abstain from other courses of medication during the run in phase including non-steroidal anti-inflammatory drugs (NSAIDs), anti-depressant drugs, anti-histamines, anti-rhinitis or hay fever medication, other than short acting inhaled beta-agonists, ipratropium bromide and paracetamol (up to 4 g per day) for the treatment of minor ailments (eg headache) from 48h before the first dose until the follow-up visit. Subjects requiring medication between dosing and follow up may be excluded at the principal investigators discretion.