Spray dried particles are for inhalation. The particles consist of (i) at least about 70% w/w of an alginate oligomer, (ii) at least about 10% w/w in total of a phospholipid and an anti-adherent compound. and (iii) no greater than about 10% w/w of further excipients. The phospholipid is solid at room temperature, and is present at no less than 0.5% w/w. The anti-adherent compound is present at no less than 0.5% w/w. The particles, capsules and dry powder inhalers including the particles can be for therapeutic use, such as in the treatment or reduction of likelihood of a respiratory infection or a respiratory disorder.
