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

This is ceftriaxone. It is an antibiotic that treats infections caused by germs called bacteria. It may also help prevent wound infections from surgery. It does not treat infections caused by viruses, like the common cold. Patients usually tolerate it well and start feeling better soon. 

Ceftriaxone belongs to a group of antibiotics called 'cephalosporins'. It is similar to penicillin. You should tell your doctor if you have an allergy to cephalosporins or penicillins. 

Ceftriaxone may be given as a shot. You could develop tenderness, warmth or a bump at the site. Ceftriaxone may also be given as an infusion in your vein. Your caregiver will monitor your infusion site, which is usually your arm. You can help keep an eye on the area, and report any swelling or pain. 

Other side effects could occur. If you notice any changes to your body, like a headache, dizziness, nausea, or a rash, you should let your doctor know. When taking any antibiotic, females should watch for a vaginal yeast infection and obtain treatment if it occurs. 

As with any medicine, rare but more serious side effects can occur. To help keep this medicine safe for you, your doctor will follow you closely. You should tell your doctor if you have diarrhea that is severe or that lasts more than 2 days, even if it happens months after your last dose. 

For best results with ceftriaxone, you should finish the full course. Otherwise, the infection could return and become hard to treat.