What I meant by self administered was from the patients perspective.. In that in a hospital the patient won't have the knowledge per se that they have an option of an oral med for prophylaxis; so the hospital can continue to utilize a syringe over an oral med..
You may be right that Orals will be less expensive.. I am only assuming since Lovenox is the branded leader for DVT treatment, medical prophylaxsis, surgery PX and used for bridging that they would price the ORals competitive with Lovenox..