As recently as a decade ago, treatments available were limited to the use of astringent instillations, such as clorpactin or silver nitrate, designed to kill infection and/or strip off the bladder lining. In 2005, our understanding of IC has improved dramatically and these therapies are now no longer done. Rather, IC therapy is typically multi-modal, including the use of a bladder coating, an antihistamine to help control mast cell activity and a low dose antidepressant to fight neuroinflammation.
The two US FDA approved therapies for IC have had recent setbacks in various research studies. Oral Elmiron (aka pentosan polysulfate) is believed to provide a protective coating in the bladder, however data released in late 2005 by Alza Pharmaceuticals suggests that 84% of Elmiron is eliminated, intact, in feces. Another 6% is excreted via urine.In addition, the NIH funded ICCTG study of pentosan revealed results only slightly better than placebo. The latter study was criticized, however, for targeting only the most severe IC patients who were also the least likely to respond (i.e. the NIDDK diagnostic criteria).
DMSO, a wood pulp extract, is the only approved bladder instillation for IC yet it is much less frequently used in urology clinics. Research studies presented at recent conferences of the American Urological Association by C. Subah Packer have demonstrated that the FDA approved dosage of a 50% solution of DMSO had the potential of creating irreversible muscle contraction. However, a lesser solution of 25% was found to be reversible. Long term use is questionable, at best, particularly given the fact that the method of action of DMSO is not fully understood.
More recently, the use of a "rescue instillation" composed of elmiron or heparin, Cystistat, lidocaine and sodium bicarbonate, has generated considerable excitement in the IC community because it is the first therapeutic intervention that can be used to reduce a flare of symptoms. Published studies report a 90% effectiveness in reducing symptoms.
Other bladder coating therapies include Cystistat(TM) (sodium hyaluronate) and Uracyst(TM) (chondroitin). They are believed to replace the deficient GAG layer on the bladder wall. Like most other intravesical bladder treatments, this treatment may require the patient to lie for 20 - 40 minutes, turning over every ten minutes, to allow the chemical to 'soak in' and give a good coating, before it is passed out with the urine.
The two US FDA approved therapies for IC have had recent setbacks in various research studies. Oral Elmiron (aka pentosan polysulfate) is believed to provide a protective coating in the bladder, however data released in late 2005 by Alza Pharmaceuticals suggests that 84% of Elmiron is eliminated, intact, in feces. Another 6% is excreted via urine.In addition, the NIH funded ICCTG study of pentosan revealed results only slightly better than placebo. The latter study was criticized, however, for targeting only the most severe IC patients who were also the least likely to respond (i.e. the NIDDK diagnostic criteria).
DMSO, a wood pulp extract, is the only approved bladder instillation for IC yet it is much less frequently used in urology clinics. Research studies presented at recent conferences of the American Urological Association by C. Subah Packer have demonstrated that the FDA approved dosage of a 50% solution of DMSO had the potential of creating irreversible muscle contraction. However, a lesser solution of 25% was found to be reversible. Long term use is questionable, at best, particularly given the fact that the method of action of DMSO is not fully understood.
More recently, the use of a "rescue instillation" composed of elmiron or heparin, Cystistat, lidocaine and sodium bicarbonate, has generated considerable excitement in the IC community because it is the first therapeutic intervention that can be used to reduce a flare of symptoms. Published studies report a 90% effectiveness in reducing symptoms.
Other bladder coating therapies include Cystistat(TM) (sodium hyaluronate) and Uracyst(TM) (chondroitin). They are believed to replace the deficient GAG layer on the bladder wall. Like most other intravesical bladder treatments, this treatment may require the patient to lie for 20 - 40 minutes, turning over every ten minutes, to allow the chemical to 'soak in' and give a good coating, before it is passed out with the urine.
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