It depends on which country you live in. Some countries allow the purchase of a wide variety of medications without a prescription from a doctor. Some require that it be dispensed by a pharmacist and...
Amoxicillin is an antibiotic and is prescription only.
Terazol is prescription only.
No, All the information on the Internet suggests that you will need a Doctors Prescription before being able to buy Methotrexate from a Pharmacy
Nope. I am aware of no country on the planet that does not have this medication controlled and requiring a prescription.