I Have Severe Tooth Infection After Removing Silver Filling And

i have severe tooth infection after removing silver filling and got weak antibiotic 250 mg for 5 days / from my regular doctor. I consulted dentist and he told me to wait. He checked the tooth. I am allergic to penicilin and i need to call my dentist to give me something stronger and efficient. IT IS HORRIBLE PAIN AND 250 MG OF ANTIBIOTIC ISnot helping. What is recommended now to kill infection?