Creams and gels with the active ingredients N,N-Diethyl-m-toluamide (DEET, or diethyltoluamide) or picaridin provide the best protection against mosquito bites.
Most products provide protection for between one and three hours. Follow the label instructions when applying any repellent.
If you swim or sweat profusely, protection will be less and you may need to re-apply.
Visit the Better Health Channel or the Royal Children's Hospital for more information about mosquito repellent use.