Selling samples

I am an intern doctor. We get many samples of medicine from different pharmaceuticals companies. They gives us the sample and describe about the ingredients, benificial ratio for patient and we also can learn of newer generations of medicine which is available now in our country. The packet of samples contain only few medicines e.g.: 2/3 tablets, 1 injection, etc. Because its only a physician sample and over the packet it's written that "physician's sample, not for sale".

Now my question is, 'Is it halal to sell this sample and use the money for myself'? Many interns sells this product at 40-50% less than the market price. If it is not halal then can I sell and give the money to an orphan child?