Can lichen planus stops if offending medication removed?

Lichen Planus: Some drugs, such as arsenic, bismuth, or gold, can produce an eruption which appears identical to lichen planus. Exposure to certain chemicals used in the development of color photographs can also produce a similar rash. The long-term use of the drugs quinacrine or Quinidine (quinidine gluconate, Quinidine sulfate), which is used for malaria and certain microscopic organisms. Lp may stop with dc.

What medication: Oral lichen planus regresses in a few months so don't worry.

Yes: It will subside if it was caused by the offending medication.