Ceftibuten is a 3rd generation cephalosporin that is FDA approved for the treatment of acute bacterial exacerbations of chronic bronchitis, acute bacterial otitis media, pharyngitis and tonsillitis. Ceftibuten exerts its bactericidal action by binding to essential target proteins of the bacterial cell wall. This binding leads to inhibition of cell-wall synthesis. Common adverse reactions include diarrhea, nausea, vomiting and headache. The effect of increased gastric pH on the bioavailability of ceftibuten was evaluated in 18 healthy adult volunteers. Each volunteer was administered one 400-mg ceftibuten capsule. A single dose of liquid antacid did not affect the Cmax or AUC of ceftibuten; however, 150 mg of ranitidine q12h for 3 days increased the ceftibuten Cmax by 23% and ceftibuten AUC by 16%.

Lomefloxacin hydrochloride (marketed under the following brand names in English speaking countries Maxaquin, Okacyn, Uniquin) is a fluoroquinolone antibiotic used to treat bacterial infections. It is used to treat chronic bronchitis, as well as complicated and uncomplicated urinary tract infections. It is also used as a prophylactic or preventative treatment to prevent urinary tract infections in patients undergoing transrectal or transurethral surgical procedures. Flouroquinolones such as lomefloxacin possess excellent activity against gram-negative aerobic bacteria such as E.coli and Neisseria gonorrhoea as well as gram-positive bacteria including S. pneumoniae and Staphylococcus aureus. They also posses effective activity against shigella, salmonella, campylobacter, gonococcal organisms, and multi drug resistant pseudomonas and enterobacter. Lomefloxacin is a bactericidal fluoroquinolone agent with activity against a wide range of gram-negative and gram-positive organisms. The bactericidal action of lomefloxacin results from interference with the activity of the bacterial enzymes DNA gyrase and topoisomerase IV, which are needed for the transcription and replication of bacterial DNA. DNA gyrase appears to be the primary quinolone target for gram-negative bacteria. Topoisomerase IV appears to be the preferential target in gram-positive organisms. Interference with these two topoisomerases results in strand breakage of the bacterial chromosome, supercoiling, and resealing. As a result DNA replication and transcription is inhibited.

Enoxacin is an oral broad-spectrum fluoroquinolone antibacterial agent used in the treatment of urinary tract infections and gonorrhea. Enoxacin is bactericidal drugs, eradicating bacteria by interfering with DNA replication. Like other fluoroquinolones, enoxacin functions by inhibiting bacterial DNA gyrase and topoisomerase IV. The inhibition of these enzymes prevents bacterial DNA replication, transcription, repair and recombination. Enoxacin is active against many Gram-positive bacteria. After oral administration enoxacin is rapidly and well absorbed from the gastrointestinal tract. The antibiotic is widely distributed throughout the body and in the different biological tissues. Tissue concentrations often exceed serum concentrations. The binding of enoxacin to serum proteins is 35 to 40%. The serum elimination half-life, in subjects with normal renal function, is approximately 6 hours. Approximately 60% of an orally administered dose is excreted in the urine as unchanged drug within 24 hours. Enoxacin, like other fluoroquinolones, is known to trigger seizures or lower the seizure threshold. The compound should not be administered to patients with epilepsy or a personal history of previous convulsive attacks as may promote the onset of these disorders.

Cefmetazole is a semisynthetic cephamycin antibiotic. It has a broad spectrum of activity comparable to that of the second-generation cephalosporins, covering gram-positive, gram-negative, and anaerobic bacteria. Its bactericidal action results from inhibition of cell wall synthesis. It effectively treats abdominal and respiratory tract infections, pelvic inflammatory disease, urinary tract infections, skin and soft tissue infections and used for surgical prophylaxis, reducing or eliminating signs and symptoms of infection. Cefmetazole has a low frequency of adverse effects, and a side effect profile similar to that of other cephamycins. Adverse effects following overdosage have included nausea, vomiting, epigastric distress, diarrhea, and convulsions.

Cefpiramide or SM-1652 (sodium 7-[D(-)-alpha-(4-hydroxy-6-methylpyridine-3-carboxamido)-alpha-(4-hydroxyphenyl)acetamido]-3-[(1-methyl-1H-tetrazol-5-yl) thiomethyl]-3-cephem-4-carboxylate) is a semisynthetic cephalosporin derivative with a broad spectrum of antibacterial activity. This antibiotic has been reported to have potent in vitro and in vivo antibacterial activities against gram-positive and -negative bacteria.

Cefotiam is a third generation beta-lactam cephalosporin antibiotic. It has broad spectrum activity against Gram positive and Gram negative bacteria. It does not have activity against Pseudomonas aeruginosa. The bactericidal activity of cefotiam results from the inhibition of cell wall synthesis via affinity for penicillin-binding proteins (PBPs).

Cefmenoxime is a semisynthetic beta-lactam cephalosporin antibiotic with activity similar to that of cefotaxime. Like other 'third-generation' cephalosporins it is active in vitro against most common Gram-positive and Gram-negative pathogens, is a potent inhibitor of Enterobacteriaceae (including beta-lactamase-producing strains), and is resistant to hydrolysis by beta-lactamases. Cefmenoxime has a high rate of clinical efficacy in many types of infection and is at least equal in clinical and bacteriological efficacy to several other cephalosporins in urinary tract infections, respiratory tract infections, postoperative infections and gonorrhoea. The bactericidal activity of cefmenoxime results from the inhibition of cell wall synthesis via affinity for penicillin-binding proteins (PBPs). Cefmenoxime is stable in the presence of a variety of b-lactamases, including penicillinases and some cephalosporinases. Cefmenoxime is marketed in Japan under the brand name Bestron, indicated for the treatment of otitis externa, otitis media, and sinusitis. Cefmenoxime hydrochloride was approved by the U.S. Food and Drug Administration (FDA) on Dec 30, 1987. It was developed and marketed as Cefmax®, but it has being discontinued.

Norfloxacin is an antibacterial agent, It inhibits inhibits DNA synthesis by inhibiting DNA gyrase enzyme. Norfloxacin was approved in 1986 for treatment of urinary tract infections, gynecological infections, prostatitis, gonorhhea and bladder infections. In ophtalmology, norfloxacin is used for treatment of conjunctivitus.

Cefonicid is a semi-synthetic broad-spectrum cephalosporin antibiotic resistant to beta-lactamases. Similarly to other cephalosporins, cefonicid exerts its antibacterial activity through the inhibition of the bacterial cell-wall synthesis. Its in vitro and in vivo activity against a wide range of Gram-positive and Gram-negative microorganisms is documented.

Ceforanide is a new cephalosporin with a longer elimination half-life than any currently available cephalosporin. Its activity is very similar to that of cefamandole, a second-generation cephalosporin, except that ceforanide is less active against most gram-positive organisms. The bactericidal activity of ceforanide results from the inhibition of cell wall synthesis via affinity for penicillin-binding proteins (PBPs). Ceforanide is primarily indicated in conditions like bone and joint infection, endocarditis, respiratory tract infections, skin infections, surgical infections, urinary tract infection. Rash and pruritus, and nausea, vomiting and other mild gastrointestinal side effects were noted in a few of the subjects but were mild and transient.