Many people especially here in Africa see it cheaper to buy medicine from medical centres or pharmacies direct without consulting professional medical personnel. This cuts off the costs of consulting the doctor which is minimum UShs 10,000 which is approximately USD 3. But the risks can get a lot worse when you administer yourself the wrong medicine with chances of leading to death.
Before establishing what you think is the right medicine for yourself, you need to ensure that a medical personnel has confirmed it's the right medicine to get you better. A professional medical personnel is trained to assess the health condition of a person and then prescribe the exact amount of dosage of a drug they are supposed to take in in the right quantity to get back to their feet.
Visit a medical personnel whenever you feel something is not right with your health. The solution might not even be medicine, so watch out and end this habit.