Let's take a minute to talk about your medication. 

This is penicillin VK, and you should take it as directed by your doctor.  

It treats infections caused by bacteria, but it can't treat viral infections, like the common cold. If this is liquid penicillin, shake the bottle well before each dose. Also, use a measuring spoon to get an accurate dose. 

You should start feeling better soon, but finish the full course, or your infection could return and become hard to treat. 

Some side effects are common, like mild diarrhea. Your pharmacist can advise you how to lessen this. If diarrhea is ever severe or doesn't go away, you should call your doctor promptly. You should also call right away if your stools are watery and bloody, even if it has been two months since the last dose. 

As with any medicine, rare but more serious side effects can occur. You should call your doctor if you notice any unusual changes to your body, like a rash. Also, get help right away if you have problems breathing or swelling of your face or throat, because it could be an allergic reaction. 

Lastly, antibiotics can sometimes cause an infection in the mouth called thrush, so call your doctor if you have white patches inside your mouth or problems swallowing. Women should also watch for a vaginal yeast infection, and treat it if it happens. 

For best results, don't skip doses, and let your doctor know if your infection gets worse or doesn't improve.