Bactidol® contains substances that have a marked anti-microbial effect, which account for their use in cold prevention. However, it is advisable to start their use at the onset of a sore throat – it helps to deal with the illness as quickly as possible so it doesn't worsen.
What works best to prevent colds, is to follow a fitness regime, take vitamins, have a healthy diet and sleep routine, and other measures to strengthen the immune system.
1Wile DB. Hexetidine: A report on its antibacterial and antifungal properties on the oral flora in healthy subjects. Cur. Med. Res. Opin. (1986), p. 12
2Ministry of Health of the Russian Federation Federal State Budget Institution. Study of in vitro antiviral activity of Hexetidine against a number of viruses causing acute respiratory infection. 2014 (Data on File)
3Deryabin PG et. Al. Bulletin of Experimental Biology and Medicine, Vol. 160, No. 3, January 2016 VIROLOGY
4The telegraph. Accessed from http://www.telegraph.co.uk/finance/jobs/8806388/Top-10-causes-of-absenteeism.html . Accessed on 6 May 2016