Most colds are caused by a virus and antibiotics do not help.

Antibiotics are used to treat bacterial infections, and most colds are caused by a virus.  Antibiotics do not cure viruses.  The use of antibiotics when they are not needed increases your risk of getting an infection later on that resists antibiotic treatment.

When you have a cold the best treatment is to drink plenty of fluids, get more rest and ask your Primary Care Physician if over the counter products would help.