Shopping for medicine for the first time

Last week, in addition to having fever and cough, Caleb also had green stuff oozing out of his eyes. His eyes were red, a little swollen, and itchy. We suspected it was infection, so I went across the street to a hole in the wall shop that sells medicine. I told the lady I needed something for eye infection. She looked on the shelf and grabbed a something that looked like a sort of eye-wash solution and gave it to me saying, " 10,000VND." I read the Vietnamese on the box, opened it, and read the piece of paper inside. I understood enough to guess it was just a Vietnamese-made solution for itchy eyes caused by dust or allergies. I asked the lady if she had anything else and she gave me a more expensive box with a Japanese brand. I read that one and I think it was something similar, used to treat strained eyes. There was nothing else, so I gave the lady 10,000VND and took the little box home. I googled the name of the drug but found nothing, of course.
I applied the drops to Caleb's eyes a few times that day, but they didn't seem to improve the following day. So, I got on my bike and rode farther, visiting three other local shops. At one better-looking shop, the guy didn't want to talk to me and just told me to go see a doctor and come back with a prescription. I was surprised!!! I stood there and thought, "that would be a lot of work! how would I go about finding a doctor here?" So, I got back on my bike and went to the next shop. This one was not as big, but the lady didn't tell me to go away. Again, I asked for something to treat eye infection, and she pulled out a box from under the counter. It was the same box I bought the day before from the shop across the street. I asked for something else, and she gave me the same Japanese-brand eye wash. I asked if there were something else stronger, she asked me how much money I was willing to spend. I didn't know how much to say, so I just told her something more expensive. She went to the back of the store and came back with a small box with the name Tobrex and said, "38,000VND." I saw the word "Tobramycin" on the box and knew it was antibiotic. Next I looked for where it was made. It came from Belgium. I asked the lady if it could be used for children, and she said no. I asked if she had something similar to this, but for children, and she said no. I opened the box and read the paper on the inside, it didn't mention anything about children. Since I was desperate, I decided to buy it. I gave her the money and rode home. Once I got home, I googled the word Tobrex and found good information on it, including the fact that it could be used on children. I gave it to Caleb, and two days later, the green gooey stuff was gone and his eyes were back to normal!
Belgian drugs and Belgian doctor, in Vietnam...