The purpose of this study is to examine the efficacy of dimethylsulphoxide (DMSO) cocktail in patients with interstitial cystitis during the treatment period (12 weeks) and after it (at 6 weeks, 3, 6 and 12 month).

The modern treatment of IC is a multi-modal treatment which includes behavioural treatment, physiotherapy of the pelvic floor musculature, oral medication (e.g. Amitryptiline) and intra-vesical instillation (e.g. DMSO, steroids, heparin). These treatments were found to be effective in a number of studies and are approved by the FDA. However, the optimal duration of intra-vesical instilation is not known.

All patients with IC (according to the international continence society criteria) will receive 12 weekly intra-vesical instillation of DMSO. All patients will fill an O'leary-Sant questionaire and a urination diary before treatment, after 3, 6, 9 and 12 treatments and at 6 weeks, 3, 6 and 12 month after the end to the treatment.

Inclusion Criteria:

• patients with IC according to International Continence Society:

  • more than 6 month of pelvic pain
  • urinary frequency, urgency, dyspareunia

Exclusion Criteria:

• genitourinary tract infection
• known genitourinary malformation