Duac works by making use of two active ingredients. The first one is called clindamycin, the number one antibiotic in the UK for treating acne. This has benefits over minocycline (which is the number one antibiotic used in the US), as it does not discolour or stain teeth.
The second active ingredient is known as benzyol peroxide, an ingredient which can be found in most acne treatments. The benzoin and the hydrogen peroxide work by killing any acne bacteria remaining on the skin. By combining with clindamycin these ingredients stop the bacteria from becoming resistant to one antibiotic.
Studies have shown that Duac works within 48 hours of use, much faster than any other combination treatment available on the market.