Insulin pen is avalaible in all leading pharmacies - Call them LANTUS SOLOSTAR.. hope u r taking this one. 

Or do u use reusable cartridge.. 

what ever it is - it is available freely... I dont think u need a prescription. 

At Hamad health center they give u this very cheap provided u have health card. 

If its urgent then u can meet : www.pcpqatar.com and enquire in the pharmacy or u can c the doctor.