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Doribax Dosage

Generic name: DORIPENEM 500mg in 10mL
Dosage form: injection, powder, for solution

The information at Drugs.com is not a substitute for medical advice. Always consult your doctor or pharmacist.

2.1 Recommended Dosage

The recommended dosage of DORIBAX® is 500 mg administered every 8 hours by intravenous infusion over one hour in patients ≥18 years of age. The recommended dosage and administration by infection is described in Table 1:

Table 1: Dosage of DORIBAX® by Infection
*
Duration includes a possible switch to an appropriate oral therapy, after at least 3 days of parenteral therapy, once clinical improvement has been demonstrated.
Duration can be extended up to 14 days for patients with concurrent bacteremia.
 Infection  Dosage  Frequency  Infusion Time (hours)  Duration
 Complicated intra-abdominal infection  500 mg  every 8 hours  1  5–14 days*
 Complicated UTI, including pyelonephritis  500 mg  every 8 hours  1  10 days*  

2.2 Patients with Renal Impairment

Table 2: Dosage of DORIBAX® in Patients with Renal Impairment
*
[see Preparation of 250 mg DORIBAX® dose using the 250 mg vial and Preparation of 250 mg DORIBAX® dose using the 500 mg vial (2.3)]
 Estimated CrCl (mL/min)  Recommended Dosage Regimen of DORIBAX®
 > 50  No dosage adjustment necessary
 ≥ 30 to ≤ 50  250 mg* administered intravenously (over 1 hour) every 8 hours
 > 10 to < 30  250 mg* administered intravenously (over 1 hour) every 12 hours

The following formula may be used to estimate CrCl. The serum creatinine used in the formula should represent a steady state of renal function. 

 Males: Creatinine clearance (mL/min) =  weight (kg) × (140 - age in years)
72 × serum creatinine (mg/dL)
 Females: Creatinine clearance (mL/min) =  0.85 × value calculated for males

DORIBAX® is hemodialyzable; however, there is insufficient information to make dose adjustment recommendations in patients on hemodialysis.

2.3 Preparation of Solutions

DORIBAX® does not contain a bacteriostatic preservative. Aseptic technique must be followed in preparation of the infusion solution.

To prepare DORIBAX® infusions in Baxter Minibag Plus™ infusion bags consult the infusion bag manufacturer's instructions.

Parenteral drug products should be inspected visually for particulate matter and discoloration prior to use whenever solution and container permit. DORIBAX® infusions range from clear, colorless solutions to solutions that are clear and slightly yellow. Variations in color within this range do not affect the potency of the product.

Preparation of 500 mg DORIBAX® dose using the 500 mg vial

  • Constitute the 500 mg vial with 10 mL of sterile water for injection or 0.9% sodium chloride injection (normal saline) and gently shake to form a suspension. The resultant concentration is approximately 50 mg/mL. CAUTION: THE CONSTITUTED SUSPENSION IS NOT FOR DIRECT INJECTION.
  • Withdraw the suspension using a syringe with a 21 gauge needle and add it to an infusion bag containing 100 mL of normal saline or 5% dextrose; gently shake until clear. The final infusion solution concentration is approximately 4.5 mg/mL.

Preparation of 250 mg DORIBAX® dose using the 250 mg vial

  • Constitute the 250 mg vial with 10 mL of sterile water for injection or 0.9% sodium chloride injection (normal saline) and gently shake to form a suspension. The resultant concentration is approximately 25 mg/mL. CAUTION: THE CONSTITUTED SUSPENSION IS NOT FOR DIRECT INJECTION.
  • Withdraw the suspension using a syringe with a 21 gauge needle and add it to an infusion bag containing either 50 or 100 mL of normal saline or 5% dextrose; gently shake until clear. The final infusion solution concentration is approximately 4.2 mg/mL (50 mL infusion bag) or approximately 2.3 mg/mL (100 mL infusion bag).

Preparation of 250 mg DORIBAX® dose using the 500 mg vial

  • Constitute the 500 mg vial with 10 mL of sterile water for injection or 0.9% sodium chloride injection (normal saline) and gently shake to form a suspension. The resultant concentration is approximately 50 mg/mL. CAUTION: THE CONSTITUTED SUSPENSION IS NOT FOR DIRECT INJECTION.
  • Withdraw the suspension using a syringe with a 21 gauge needle and add it to an infusion bag containing 100 mL of normal saline or 5% dextrose; gently shake until clear.
  • Remove 55 mL of this solution from the bag and discard.
  • Infuse the remaining solution, which contains 250 mg (approximately 4.5 mg/mL).

2.4 Compatibility

The compatibility of DORIBAX® with other drugs has not been established. DORIBAX® should not be mixed with or physically added to solutions containing other drugs.

2.5 Storage of Constituted Solutions

Upon constitution with sterile water for injection or 0.9% sodium chloride (normal saline) injection, DORIBAX® suspension in the vial may be held for 1-hour prior to transfer and dilution in the infusion bag.

Following dilution of the suspension with normal saline or 5% dextrose, DORIBAX® infusions stored at room temperature or under refrigeration should be completed according to the times in Table 3.

Table 3: Storage and Stability Times of Infusion Solutions Prepared in Normal Saline or 5% Dextrose
 Infusion prepared in  Stability Time at Room Temp. (includes room temperature storage and infusion time)  Stability time at 2–8°C (Refrigeration) (includes refrigerator storage and infusion time)
 Normal saline  12 hours  72 hours
 5% Dextrose  4 hours  24 hours

Constituted DORIBAX® suspension or DORIBAX® infusion should not be frozen. This storage information applies also to DORIBAX® diluted in Baxter Minibag Plus™.

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