Being very familiar with the common pharmaceuticals, here are some tips on buying medicines which may help you,
First tip on buying medicines is that do not blindly buy medicines on your own until the provision of doctor. If you do then grasp some knowledge of pharmaceuticals.
If you are suffering with pain, you can buy analgesics( painkillers) which are non-narcotics i.e. non addictive. Some of the common analgesics are ibuprofn, paracetamol, methyl salicylate.
Do not take aspirin as it has diverse effects apart from being useful. Above mentioned medicines you should remember because they are the most common painkillers and does not require special consultation.
Always take bills, check the expiry date and if intrested then also chemical composition. These are very common things.
Do not take antibiotics unless you have high feaver along with headache and cold and cough. Use lower antibiotics like amoxicillin, streptomycin, etc of 5mg dose but never take higher antibiotics like ampicillin, aminoglycosides, tetracyclin until the provision of consultant.
Do not take tranquilizers for relaxation as it leads to various discomfort causing diseases. Take antacids when sufferering through acidity in stomach.
Hope this above knowledge be helpful to you.