Wow, so you have to pass a quiz to purchase a product? That's ... quite a novelty.
Well, in reality, you don't often get asked all the questions - usually, you just get 'is it for yourself?' and 'have you taken it before?', then they remind you of the dosage to take.
However, as someone who worked for Boots on and off for 9 years, those questions are on your till screen and you are expected to ask them of every single customer who requests OTC medicine.
It's not supposed to be a quiz or an interrogation, it's to make sure you are being recommended and sold the correct product, and that what you are buying isn't going to interfere with any medicine you are already taking, or that your symptoms haven't persisted for so long that you should really see a doctor.
For example, I had a customer who came into the store and wanted to buy cold and flu sachets, which contained 1000mg paracetamol, and a decongestant in every sachet.
The conversation went something like this:
Me: who is it for?
Him: Myself
Me: What are your symptoms?
Him: I have a stuffy nose and a headache
Me: And how long have you had the symptoms?
Him: About 3 days now
Me: What have you taken already?
Him: Well, I've been taking one of these sachets every 4 hours, and I'm also taking paracetamol 4 times a day as well
Me: Actually, these cold and flu sachets you are taking already contain the maximum dosage of paracetamol you can take in one day, so you shouldn't be taking paracetamol tablets as well, because it means you're taking too much, which could damage your liver. You need to make sure that if you are taking the sachets, you don't take any other paracetamol products
Him: Oh, wow, I had no idea these sachets had paracetamol in them too. I'll stop taking the other paracetamol right away. Thank you so much for pointing that out
Me: Not a problem. Can I just ask, are you taking any other medication?
Him: No, I'm not.
Me: Okay, well, that'll be £3, please.
Another scenario that happened often was people buying decongestants:
Customer: I'd like to buy a packet of Sudafed, please.
Me: Certainly. Is it for yourself?
Customer: Yes, it is. I'm suffering from blocked sinuses
Me: Have the symptoms persisted long?
Customer: No, they just started today
Me: Have you taken anything already for it?
Customer: No, not yet. I've come in now to buy something.
Me: Okay, no problem. Are you taking any other medication at all?
Customer: Yes, I'm taking medication for high blood pressure
Me: Ah, okay, well, the thing is that decongestants like Sudafed work by restricting the blood vessels, which can increase your blood pressure. This means that taking Sudafed can interfere with your blood pressure medication and stop it working properly and because of this I'm not going to be able to sell this to you. Instead, you could try something like eucalyptus oil to help with your sinuses, or perhaps visit your doctor and see if there's anything they can prescribe for you.