[tabs][tabs: ]
Class: Interstitial cystitis agent
Trade Names:
Azo-Gesic
- Tablets 95 mg
Trade Names:
Azo-Septic
- Tablets 95 mg
Trade Names:
Azo-Standard
- Tablets 95 mg
Trade Names:
Baridium
- Tablets 97 mg
Trade Names:
Pyridium
- Tablets 100 mg
- Tablets 200 mg
Phenazo (canada)
Mechanism of Action
Pharmacology
Exerts topical analgesic effect on urinary tract mucosa.
Pharmacokinetics
Metabolism
Phenazopyridine metabolism is probably hepatic; also in other body tissues. One active metabolite is acetaminophen.
Elimination
Phenazopyridine is rapidly excreted by the kidneys, 65% as unchanged drug and metabolites.
[viene rapidamente escreta dai reni, al 65% immodificato e metaboliti]
Indications and Usage
Symptomatic relief of pain, burning, urgency, frequency and other discomforts arising from irritation of lower urinary tract mucosa.
Contraindications
Renal insufficiency.
Dosage and Administration
Adults
PO 200 mg 3 times daily.
Children 6 to 12 yr of age
PO 12 mg/kg/24 h divided into 3 doses for 2 days.
General Advice
Administer after meals to avoid GI irritation.
Do not crush tablets or make into a suspension.
Storage/Stability
Store at controlled room temperature (59° to 86°F).
Drug Interactions
None well documented.
Laboratory Test Interactions
Possible interference with colorimetric lab test procedures and urinalysis based on spectrometry or color reactions.
Adverse Reactions
CNS
Headache.
Dermatologic
Rash; pruritus.
GI
Occasional GI disturbances.
Genitourinary
Renal toxicity.
Hematologic
Methemoglobinemia; hemolytic anemia.
Hepatic
Hepatotoxicity.
Miscellaneous
Anaphylactoid reaction.
Precautions
Pregnancy
Category B .
Lactation
Unknown.
Renal Function
May lead to accumulation, indicated by yellow tinge to skin and sclera.
Overdosage
Symptoms
Methemoglobinemia, hemolytic anemia, hemolysis, renal and hepatic function impairment and failure.
Patient Information
Inform patient that this drug should not be taken long term for undiagnosed urinary tract pain.
Advise patient to take drug after meals to avoid GI upset.
Inform patient that urine may temporarily become reddish-orange in color and may stain fabric.
Advise patient to wear glasses instead of contact lenses while taking this drug; contact lenses may become discolored.
Inform patients with diabetes of possible interference with urine glucose test results.
Instruct patient not to crush or chew tablets. Permanent teeth discoloration may occur.
Instruct patient that if skin or sclera become yellowish in color, to discontinue drug and notify health care provider.
Instruct patient to notify health care provider if headache, rash, pruritus, upset stomach, dizziness, or difficulty breathing occurs.
Read more:
http://www.drugs.com/ppa/phenazopyridin ... z11ndsoBYc[/tabs]
Pyridium® (phenazopyridine hydrochloride) is chemically designated 2,6-Pyridinediamine, 3-(phenylazo), monohydrochloride. It is a urinary tract analgesic agent for oral administration. Phenazopyridine Hydrochloride tablets contain 100 mg or 200 mg Phenazopyridine Hydrochloride. Also contains lactose hydrous, sodium starch glycolate, corn starch, hydrogenated vegetable oil, silicon dioxide, magnesium stearate, sugar, gelatin, FD&C red #40 aluminum lake, titanium dioxide, FD&C blue #2 aluminum lake, povidone, sodium benzoate, carnauba wax and white wax
http://www.rxlist.com/pyridium-drug.htmCLINICAL PHARMACOLOGY:
Phenazopyridine Hydrochloride is excreted in the urine where it exerts a topical analgesic
effect on the mucosa of the urinary tract. This action helps to relieve pain, burning,
urgency and frequency.
The precise mechanism of action is not known.http://docs.google.com/viewer?a=v&q=cac ... gl=it&pid=