In the first quarter of 2006, DUSA Pharmaceuticals obtained Sirius Laboratories in a merger estimated to be worth 30 million dollars. Sirius was a privately held dermatology specialty pharmaceuticals company founded by Dr. Joel E. Bernstein in 2000 dedicated to the treatment of acne vulgaris and acne rosacea.
- "DUSA Pharmaceuticals Closes Acquisition of Sirius Laboratories". BNET. 2006-04-14. Retrieved 2008-08-26.
- Caraco Pharmaceutical Laboratories Announces Successful Tender Offer To Acquire DUSA.  and