Zenoxil

Uses

Ampicillin is used for the treatment of infections caused by susceptible strains of the designated organism listed below:

• Infections of the Genitourinary Tract Including Gonorrhea: E. coli, P. mirabilis, enterococci, Shigella, S. typhosa and other Salmonella, and nonpenicillinase-producing N. gononhoeae.
• Infections of the Respiratory Tract: Nonpenicillinase-producing H. influenzae and staphylococci, and streptococci including streptococcus pneumoniae.
• Infections of the Gastrointestinal Tract: Shigella, S. typhosa and other Salmonella, E. coli, P. mirabilis, and enterococci.
• Meningitis: O. Meningitides.

Bacteriology studies to determine the causative organisms and their sensetivity to ampicillin should be performed. Therapy may be instituted prior to the results of susceptibility testing.

Cloxacillin is used for the treatment of infections caused by Grampositive organisms including infections caused by β-lactamase producing Staphylococci such as :

• Skin and soft tissue infections : Boils, Abscesses, Carbuncles, Furunculosis, Cellulitis, Infected wounds, Infected burns, Otitis media and externa, Protection of skin graft and Skin infections like ulcer, eczema, acne, etc.
• Respiratory tract infections : Pneumonia, Lung abscess, Empyema, Sinusitis, Pharyngitis and Tonsillitis.
• Other infections caused by sensitive organisms : Osteomyelitis, Enteritis, Endocarditis, Urinary tract infection, Meningitis and Septicaemia.

Zenoxil is also used to associated treatment for these conditions: Bacterial Infections, Bloodstream Infections, Endocarditis, Gastrointestinal Infections, Genitourinary tract infection, Infection, Infection caused by eikenella corrodens, Listeria infection, Meningitis, Bacterial, Pertussis, Respiratory Tract Infections (RTI), Salmonella, Salmonella Typhi Infection, Shigella, Skin Infections, Bacterial, Subcutaneous bacterial infection, Urinary Tract Infection, Perinatal group B streptococcus, Susceptible Bacterial InfectionsInfection caused by staphylococci, Infections caused by penicillinase-producing staphylococci, Pneumococcal Infection, Streptococcal Infections

How Zenoxil works

By binding to specific penicillin-binding proteins (PBPs) located inside the bacterial cell wall, Ampicillin inhibits the third and last stage of bacterial cell wall synthesis. Cell lysis is then mediated by bacterial cell wall autolytic enzymes such as autolysins; it is possible that Ampicillin interferes with an autolysin inhibitor.

By binding to specific penicillin-binding proteins (PBPs) located inside the bacterial cell wall, cloxacillin inhibits the third and last stage of bacterial cell wall synthesis. Cell lysis is then mediated by bacterial cell wall autolytic enzymes such as autolysins; it is possible that cloxacillin interferes with an autolysin inhibitor.

Dosage

Zenoxil dosage

Intra-articular:Supplement in systemic therapy for treatment of susceptible infections-

• Adult:500 mg daily.
• Child:<10 yrHalf of adult routine dosage.

Intraperitoneal:

Supplement in systemic therapy for treatment of susceptible infections-

• Adult:500 mg daily.
• Child:<10 yrHalf of adult routine dosage.

Intrapleural:

Supplement in systemic therapy for treatment of susceptible infections-

• Adult:500 mg daily.
• Child:<10 yrHalf of adult routine dosage

Intravenous:

Meningitis-

• Adult:2 gm 6 hrly.
• Child:150 mg/kg daily in divided doses.

Intrapartum prophylaxis against group B Streptoccocal infection in neonates-

• Adult:Initially, 2 gm via IV inj followed by 1 gm 4 hrly until delivery.

Oral:

Biliary tract infections, Bronchitis, Endocarditis, Gastroenteritis, Listeriosis, Otitis media, Perinatal streptococcal infections, Peritonitis-

• Adult:0.25-1 gm 6 hrly.
• Child:<10 yrHalf of adult routine dosage.

Typhoid and paratyphoid fever-

• Adult:1-2 gm 6 hrly for 2 wk in acute infections, and 4-12 wk in carriers.

Uncomplicated gonorrhoea-

• Adult:2 gm with 1 gm of probenecid as single dose, recommended to be repeated in female patients.

Urinary tract infections-

• Adult:500 mg 8 hrly.

Parenteral:

Susceptible infections-

• Adult:500 mg 6 hrly, via IM or slow IV inj over 3-5 min or by infusion.
• Child:<10 yrHalf of adult routine dosage.

Septicaemia-

• Adult:150-200 mg/kg daily. Initiate with IV admin for at least 3 days, then continue with IM inj 3-4 hrly. Continue treatment for at least 48-72 hr after the patient has become asymptomatic or when there is evidence of bacterial eradication. Recommended treatment duration for infections caused by group-A β-haemolytic streptococci: At least 10-days, to prevent occurrence of acute rheumatic fever or acute glomerulonephritis.
• Child:Same as adult dose.

Upper Respiratory Tract Infection (Adult):

• Usual Dose: 250 mg orally every 6 hours for 7 to 14 days, depending on the nature and severity of the infection.
• Maximum dose: 4 g/day.

Upper Respiratory Tract Infection (Pediatric):

• Usual Dose: The safety and efficacy of cloxacillin in children < 1 year have not been established.
• ≥ 1 year to 18 years: 50 to 100 mg/kg/day orally divided every 6 hours.
• Maximum dose: 4 g/day.

Pneumonia(Adult):

• Usual Dose: 500 mg orally every 6 hours for up to 21 days, depending on the nature and severity of the infection.
• Maximum dose: 4 g/day.

Pneumonia(Pediatric):

• Usual Dose: The safety and efficacy of cloxacillin in children < 1 year have not been established.
• ≥ 1 year to 18 years: 50 to 100 mg/kg/day orally divided every 6 hours.
• Maximum dose: 4 g/day.

Skin and Structure Infection(Adult):

• Usual Dose: 500 mg orally every 6 hours for 7 days, or until 3 days after acute inflammation resolves, depending on the nature and severity of the infection.
• Maximum dose: 4 g/day.

Skin and Structure Infection (Pediatric):

• Usual Dose: The safety and efficacy of cloxacillin in children < 1 year have not been established.
• ≥ 1 year to 18 years: 50 to 100 mg/kg/day orally divided every 6 hours.
• Maximum dose: 4 g/day.

Cystitis:

• Usual Adult Dose: 250 mg orally every 6 hours for 3 to 7 days, depending on the nature and severity of the infection. Cloxacillin is rarely indicated for the treatment of cystitis.
• Maximum dose: 4 g/day.

Should be taken on an empty stomach. Take 1 hr before or 2 hr after meals.

Intramuscular: Add 1.5 mL water for inj to 500 mg vial contents.

Intravenous: Dissolve 500 mg in 10 mL water for inj. May be added to infusion fluids or injected, suitably diluted into the drip tube.

Intra-articular: Dissolve 500 mg in up to 5 mL of water for inj or sterile procaine HCl 0.5% soln.

Intraperitoneal: Dissolve 500 mg in up to 10 mL water for inj.

Intrapleural: Dissolve 500 mg in 5-10 mL water for inj.

Side Effects

Nausea, vomiting, diarrhoea, erythematous maculo-papular rashes, sore mouth, black/hairy tongue, rash, erythema multiforme, Stevens-Johnson syndrome, toxic epidermal necrolysis, angioedema, fever, joint pains, serum sickness-like symptoms, haemolytic anaemia, thrombocytopenia, leucopenia, neutropenia, coagulation disorders, prolonged bleeding time and prothrombin time, CNS toxicity (e.g. convulsions); paraesthesia, nephropathy, interstitial nephritis, hepatitis, cholestatic jaundice, moderate and transient increase in transaminases, Anaphylaxis, Clostridium difficile-associated diarrhoea (CDAD).

Common side effects are skin rash, transient diarrhoea, nausea, heartburn, pruritus and disturbance of blood electrolyte. Rarely anaphylactic shock.

Toxicity

Oral LD₅₀ in rat and mouse is 5000 mg/kg. Intravenous LD₅₀ in rat is 1660 mg/kg. Symptoms of overdose include wheezing, tightness in the chest, fever, itching, bad cough, blue skin color, fits, and swelling of face, lips, tongue, or throat.

Precaution

Patient with history of β-lactam allergy. During renal impairment, Pregnancy and lactation.

Cloxacillin should be given with caution to patients with known history of allergy.

Interaction

May reduce the efficacy of oral contraceptives. May alter INR while on warfarin and phenindione. May reduce the efficacy of oral typhoid vaccines. May reduce the excretion of methotrexate. Reduced excretion with probenecid and sulfinpyrazone, resulting to increased risk of toxicity. Allopurinol increases ampicillin-induced skin reactions. Reduced absorption with chloroquine. Bacteriostatic antibacterials (e.g. erythromycin, chloramphenicol, tetracycline) may interfere with the bactericidal action of ampicillin.

May diminish the effect of BCG and typhoid vaccine. May increase risk of methotrexate toxicity. May diminish the therapeutic effect of Na picosulfate. May decrease serum concentrations of mycophenolate. May prolong bleeding time with anticoagulants. Increased serum concentrations with probenecid. Tetracycline may antagonise the bactericidal effect of cloxacillin.

Elimination Route

Well absorbed from the gastrointestinal tract.

Elimination Route

Ampicillin is excreted largely unchanged in the urine.

Pregnancy & Breastfeeding use

Pregnancy Category B. Either animal-reproduction studies have not demonstrated a fetal risk but there are no controlled studies in pregnant women or animal-reproduction studies have shown an adverse effect (other than a decrease in fertility) that was not confirmed in controlled studies in women in the 1st trimester (and there is no evidence of a risk in later trimesters).

Pregnancy Category B. Either animal-reproduction studies have not demonstrated a foetal risk but there are no controlled studies in pregnant women or animal-reproduction studies have shown an adverse effect (other than a decrease in fertility) that was not confirmed in controlled studies in women in the 1st trimester (and there is no evidence of a risk in later trimesters).

Contraindication

Hypersensitivity to ampicillin and other penicillins.

Cloxacillin should not be given to patients known to be hypersensitive to penicillin.

Special Warning

Renal Impairment: CrCl<10: Dose reduction or increase in dose interval.

Acute Overdose

Symptoms: Nausea, vomiting and diarrhoea. Management: Symptomatic and supportive treatment. May be removed from the circulation by haemodialysis.

Storage Condition

Store between 20-25° C. Reconstituted oral susp: Store between 2-8° C (discard after 14 days).

Dry powder: Store below 25° C. Reconstituted solution: Store between 2-8° C (stable for 4 days); 23° C (stable for 24 hr).

Innovators Monograph

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