Does anyone else struggle with knowing drugs and doses

This is not even related to medical school but my family and relatives will ask me for doses of certain drugs and I’m like ..how am I supposed to know .

my cousin sent me his medication prescription moxifloxacin and asks questions about it . I don’t even know what his complaint or illness was ( I think it ended up being urethritis ) , how am I meant TO KNOW what you should take or EVEN THE DOSEs

Is it weird to feel incompetent from that or it’s okay? 😭

I literally had to search up indications and stuff for moxifloxacin ( it was mostly used for lung disease tbh) Idk why prescribed for urethritis