Pseudoephedrine, a common oral decongestant used for a stuffy nose, can raise blood pressure and should not be taken by patients with high blood pressure. Pseudoephedrine is available on its own and in combination with other medications such as antihistamines. If you have high blood pressure, check with your doctor or pharmacist before taking any head cold preparations.

Decongestant nose sprays are quite safe but should only be taken for up to 5 days to avoid 'rebound congestion' after stopping. Some antihistamines, salt water nose sprays and steam inhalation may be of benefit.