Darvon is also known as adapalene gel, and this medication is primarily used to treat acne. Generally, this medication begins to see clinical results 4-8 weeks after treatment, with significant improvement usually after three months. Current studies have found that patients tolerate the drug relatively well for six months of use. However, it is generally recommended that patient efficacy be evaluated three months after treatment, preferably after washing the acne affected area at bedtime and waiting until the skin is dry to apply a thin layer of the drug topically to the affected area. In conclusion, Darvon or Adapalene gel is a medication for the treatment of acne, and clinical results are generally seen 4-8 weeks after treatment.