| Cough (Cochrane review [seven studies])5; one RCT10 |
| Antihistamines | Two studies: no benefit |
| Antihistamine/decongestant combination | Two studies: no benefit |
| Codeine plus guaifenesin (Robitussin AC) | One study: no benefit |
| Dextromethorphan (Delsym) | Two studies: no benefit |
| Dextromethorphan plus guaifenesin (Robitussin DM) | One study: no benefit |
| Dextromethorphan plus salbutamol* | One study: no benefit |
| Mucolytic (e.g., Letosteine*) | One study: benefit |
| Other combinations | One study: no benefit |
| Congestion and rhinorrhea (Cochrane reviews [four studies]6) |
| Antihistamines | Two studies (one using astemizole†): benefit |
| Antihistamine/decongestant combination | Two studies: no benefit |
| Decongestants | No studies |