SMS 500mg Injection contains Ceftriaxone belongs to the class of cephalosporin antibiotics and is primarily used to treat various bacterial infections, including severe conditions like E coli, pneumonia, or meningitis.  Additionally, It is employed to prevent infections in individuals undergoing certain types of surgery.

Ceftriaxone, being a potent antibiotic, works by inhibiting the growth of bacteria responsible for causing infections. Its mechanism involves interfering with the bacteria's ability to form cell walls, leading to their destruction and eventual elimination from the body.

The medicine should be used exactly as directed, and patients are advised to follow all instructions provided.

Common side effects may include symptoms of a blood cell disorder, diarrhea, vaginal itching or discharge, warmth, a tight feeling, or a hard lump at the injection site, rash, or abnormal liver function tests. 

It's essential to note that severe side effects may occur, such as severe stomach pain, persistent diarrhea, signs of new infection, or allergic reactions. If any of these occur, prompt medical attention is necessary.

Special precautions should be taken, and should not be used if there is a known severe allergic reaction to cephalosporin antibiotics.  Caution is also advised in individuals with a history of liver or kidney disease, gallbladder disease, diabetes, or bleeding problems.

If a dose is missed, patients should contact their doctor for instructions.

It's important to be aware that certain medications, such as fluconazole or vancomycin, may interact with Ceftriaxone. Patients should inform their doctor about all medications they are currently taking to prevent any potential drug interactions.