If your symptoms do not improve within a few days, or if they become worse, check with your doctor.

Penicillins may cause diarrhea in some patients.

• Check with your doctor if severe diarrhea occurs . Severe diarrhea may be a sign of a serious side effect. Do not take any diarrhea medicine without first checking with your doctor . Diarrhea medicines may make your diarrhea worse or make it last longer.
• For mild diarrhea, diarrhea medicine containing kaolin or attapulgite (e.g., Kaopectate tablets, Diasorb) may be taken. However, other kinds of diarrhea medicine should not be taken. They may make your diarrhea worse or make it last longer.
• If you have any questions about this or if mild diarrhea continues or gets worse, check with your health care professional.

Oral contraceptives (birth control pills) containing estrogen may not work properly if you take them while you are taking ampicillin, amoxicillin, or penicillin V. Unplanned pregnancies may occur. You should use a different or additional means of birth control while you are taking any of these penicillins. If you have any questions about this, check with your health care professional.

For diabetic patients:

• Penicillins may cause false test results with some urine sugar tests. Check with your doctor before changing your diet or the dosage of your diabetes medicine.

Before you have any medical tests, tell the doctor in charge that you are taking AMOXICILLIN. The results of some tests may be affected by AMOXICILLIN.

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Stop taking AMOXICILLIN and get emergency help immediately if any of the following side effects occur:

• Less common
  • Fast or irregular breathing;  fever;  joint pain;  lightheadedness or fainting (sudden);  puffiness or swelling around the face;  red, scaly skin;  shortness of breath ;  skin rash, hives, itching 
  
  

In addition to the side effects mentioned above, check with your doctor immediately if any of the following side effects occur:

• Rare
  • Abdominal or stomach cramps and pain (severe);  abdominal tenderness;  convulsions (seizures);  decreased amount of urine;  diarrhea (watery and severe), which may also be bloody;  mental depression;  nausea and vomiting;  pain at place of injection;  sore throat and fever ;  unusual bleeding or bruising;  yellow eyes or skin 
  
  

  Some of the above side effects (severe abdominal or stomach cramps and pain, and watery and severe diarrhea, which may also be bloody) may also occur up to several weeks after you stop taking any of these medicines.

• Rare--For penicillin G procaine only
  • Agitation or combativeness;  anxiety ;  confusion;  fear of impending death;  feeling, hearing, or seeing things that are not real 
  
  

Other side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. However, check with your doctor if any of the following side effects continue or are bothersome:

• More common
  • Diarrhea (mild);  headache;  sore mouth or tongue;  vaginal itching and discharge;  white patches in the mouth and/or on the tongue 
  
  

Other side effects not listed above may also occur in some patients. If you notice any other effects, check with your doctor.

Once a medicine has been approved for marketing for a certain use, experience may show that it is also useful for other medical problems. Although these uses are not included in product labeling, penicillins are used in certain patients with the following medical conditions:

• Chlamydia infections in pregnant women—Amoxicillin and ampicillin
• Gas gangrene—Penicillin G
• Helicobacter pylori-associated gastritis or peptic ulcer disease—Amoxicillin
• Leptospirosis—Ampicillin and penicillin G
• Lyme disease—Amoxicillin and penicillin V
• Typhoid fever—Amoxicillin and ampicillin

Other than the above information, there is no additional information relating to proper use, precautions, or side effects for these uses.