Polycillin

Polycillin is a brand name for Ampicillin, a broad-spectrum beta-lactam antibiotic. It works by inhibiting the synthesis of bacterial cell walls, leading to cell death. It is effective against many Gram-positive and Gram-negative bacteria.

Dosage by Body Weight

Dosage is highly dependent on the type and severity of infection, patient age, and renal function. It is typically administered 1 to 2 hours before meals (on an empty stomach) for optimal absorption. Complete the entire prescribed course.

  1. Body Weight
    Below 5 kg
    Dose
    Dosed individually by pediatrician (typically 25-50 mg/kg/day divided)
    Frequency
    Every 6 to 8 hours
    Tracking Notes
    Neonates and young infants require precise weight-based dosing and monitoring by a healthcare professional.
  2. Body Weight
    5-7 kg
    Dose
    62.5 mg to 87.5 mg (approx. 2.5 mL to 3.5 mL of 125mg/5mL oral suspension)
    Frequency
    Every 6 hours
    Tracking Notes
    Calculated based on standard pediatric dosing of 50 mg/kg/day for mild-to-moderate infections.
  3. Body Weight
    8-10 kg
    Dose
    100 mg to 125 mg (approx. 4 mL to 5 mL of 125mg/5mL oral suspension)
    Frequency
    Every 6 hours
    Tracking Notes
    Shake suspension well before administering. Use a calibrated measuring device.
  4. Body Weight
    11-15 kg
    Dose
    137.5 mg to 187.5 mg (approx. 5.5 mL to 7.5 mL of 125mg/5mL oral suspension)
    Frequency
    Every 6 hours
    Tracking Notes
    Alternatively, 2.75 mL to 3.75 mL of 250mg/5mL suspension can be used to decrease fluid volume.
  5. Body Weight
    16-20 kg
    Dose
    200 mg to 250 mg (approx. 4 mL to 5 mL of 250mg/5mL oral suspension)
    Frequency
    Every 6 hours
    Tracking Notes
    For severe infections, the healthcare provider may double the dose up to 100 mg/kg/day.

Formulation

CapsuleOral SuspensionInjection

Purpose

Polycillin is an aminopenicillin antibiotic used to treat a wide variety of bacterial infections, including middle ear infections, strep throat, pneumonia, urinary tract infections, salmonellosis, and meningitis.

Generic Name

Ampicillin

Scheduled Drug

Yes. This medicine should be supplied or used only according to applicable prescription and regulatory requirements.

Alternatives

Disclaimer: This information is for educational purposes only. WHO references and weight bands are simplified for tracking and must not replace medical advice. Always consult with a healthcare professional before starting or changing any medication.