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Zipsor (diclofenac potassium)

Company: Xanodyne Pharmaceuticals
Approval Status: Approved June 2009
Treatment for: mild to moderate acute pain
Areas: Neurology & Nervous System

| General Information | Clinical Results | Side Effects | Mechanism of Action | Literature References | Additional Information |


General Information

Zipsor (diclofenac potassium) liquid filled capsule is a benzeneacetic acid derivative non-steriod anti-inflammaotry drug. The mechanism of action of Zipsor, like that of other NSAIDs, is not completely understood but may involve inhibition of the cyclooxygenase (COX-1 and COX-2) pathways. Diclofenac’s mechanism may also be related to prostaglandin synthetase inhibition.

Zipsor is specifically indicated for the relief of mild to moderate acute pain in adults (18 years of age or older).

Zipsor is supplied as a 25mg liquid capsule designed for oral administration. The recommended initial dose is 25 mg four times a day.


Clinical Results

FDA Approval
The FDA approval of Zipsor was based on the results of two clinical studies. These multicenter, randomized, double-blind, placebo- controlled, parallel arm, multiple-dose clinical trials compared Zipsor 25 mg and placebo in patients with pain following bunionectomy with osteotomy. Once the criteria for randomization (pain intensity >4 on a 0-10 numerical pain rating scale) was met, the subjects received their initial dose of study medication followed by a re-medication dose when requested, and were then dosed every six hours over four days. Pain intensity was recorded at 3 and 6 hours postdose during the fixed dosing period. . In Study 1, mean baseline pain intensity scores were 6.9 in the Zipsor group (range: 4 to 10) and 7.3 in the placebo group (range: 4 to 10). In both studies, subjects treated with Zipsor had a lower mean pain intensity score over the 48-hour inpatient period following the first remedication dose.. The median time to onset of pain relief was less than one hour for Zipsor 25 mg across the clinical trials. The results from Study 2 were similar.


Side Effects

Adverse events associated with the use of Zipsor may include, but are not limited to, the following:

  • Abdominal pain
  • Constipation
  • Diarrhea
  • Dyspepsia
  • Nausea
  • Vomiting
  • Dizziness
  • Headache
  • Somnolence
  • Pruritus
  • Increased sweating


Mechanism of Action

Zipsor (diclofenac potassium) liquid filled capsule is a benzeneacetic acid derivative non-steriod anti-inflammaotry drug. The mechanism of action of Zipsor, like that of other NSAIDs, is not completely understood but may involve inhibition of the cyclooxygenase (COX-1 and COX-2) pathways. Diclofenac’s mechanism may also be related to prostaglandin synthetase inhibition.


Literature References

Kowalski M, Stoker DG, Bon C, Moore KA, Boesing SE A Pharmacokinetic Analysis of Diclofenac Potassium Soft-Gelatin Capsule in Patients After Bunionectomy. American Journal of Therapeutics 2009 Jun 13

Hersh EV, Levin LM, Adamson D, Christensen S, Kiersch TA, Noveck R, Watson G 2nd, Lyon JA Dose-ranging analgesic study of Prosorb diclofenac potassium in postsurgical dental pain. Clinical Therapeutics 2004 Aug;26(8):1215-27


Additional Information

For additional information regarding Zipsor or acute pain, please visit the Zipsor web page.




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Zipsor Drug Information

The Zipsor drug information shown above is licensed from Thomson CenterWatch. The information provided here is for general educational purposes only and does not constitute medical or pharmaceutical advice which should be sought from qualified medical and pharmaceutical advisers.





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