Supplies of the capsule form of the anti-AIDS drug Norvir will run out within the next month, manufacturer Abbott Laboratories has warned. The company is urging pharmacists, doctors and patients to switch to the liquid form of the drug which is still in plentiful supply. Chicago-based Abbott announced on 27 July that it was having difficulties making Norvir capsules due to a production fault. The glitch caused the formation of crystals that prevented the capsules from dissolving properly, the company said.