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Phenyl salicylate


PROSED EC (Enteric Coated) is a delayed release, dark blue tablet for oral administration. Each tablet contains: Methenamine 81.6 mg, Phenyl Salicylate 36.2 mg, Methylene Blue 10.8 mg, Benzoic Acid 9.0 mg, Atropine Sulfate 0.06 mg, and Hyoscyamine Sulfate 0.06 mg.

METHENAMINE (Hexamethylenetetramine) exists as colorless, lustrous crystals or white crystalline powder. Its solutions are alkaline to litmus. Freely soluble in water; soluble in alcohol and in chloroform.

PHENYL SALICYLATE (2-hydroxybenzoic acid phenyl ester) exists as white crystals with a melting point of 40-43°C. It is very slightly soluble in water and freely soluble in alcohol.

METHYLENE BLUE (methylthionine chloride) exists as dark green crystals. It is soluble in water and in chloroform; sparingly soluble in alcohol.

BENZOIC ACID (benzenecarboxylic acid) exists as white crystals, scales or needles. It has a slight odor and is slightly soluble in water; freely soluble in alcohol, in chloroform and in ether.

ATROPINE SULFATE (d/tropyl tropate) is an alkaloid of belladonna. It exists as an odorless, white crystalline powder that is slowly affected by light. It is very soluble in water and freely soluble in alcohol.

HYOSCYAMINE SULFATE (l-tropyl tropate) is an alkaloid of belladonna. It exists as a white crystalline powder. Its solutions are alkaline to litmus and affected by light. It is slightly soluble in water; freely soluble in alcohol; sparingly soluble in ether.

Indications and Usage

PROSED EC is indicated for the relief of discomfort of the lower urinary tract caused by hypermotility resulting from inflammation or diagnostic procedures and in the treatment of cystitis, urethritis and trigonitis when caused by organisms which maintain or produce an acid urine and are susceptible to formaldehyde.


Risk-benefit should be considered when the following medical problems exist: glaucoma, urinary bladder neck obstruction, pyloric or duodenal obstruction or cardiospasm. Hypersensitivity to any of the ingredients.


Do not exceed recommended dosage. If rapid pulse, dizziness, or blurring of vision occurs, discontinue use immediately.


Cross sensitivity and/or related problems:    Patients intolerant of other belladonna alkaloids or other salicylates may be intolerant of this medication also. Delay in gastric emptying could complicate the management of gastric ulcers.

Pregnancy/Reproduction (FDA Pregnancy Category C): Atropine, hyoscyamine and methenamine cross the placenta. Studies have not been done in either animals or humans. It is not known whether PROSED EC tablets can cause fetal harm when administered to a pregnant woman or can affect reproduction capacity. PROSED EC tablets should be given to a pregnant woman only if clearly needed.

Nursing mothers:   Methenamine and traces of atropine and hyoscyamine are excreted in breast milk. Caution should be exercised when PROSED EC tablets are administered to a nursing mother.

Prolonged use:   There have been no studies to establish the safety of prolonged use in humans. No known long-term animal studies have been performed to evaluate carcinogenic potential.

Pediatric:   Infants and young children are especially susceptible to the toxic effect of the belladonna alkaloids.

Geriatric:   Use with caution in elderly patients as they may respond to the usual doses of the belladonna alkaloids with excitement, agitation, drowsiness, or confusion.

Drug Interactions

As a result of atropine's and hyoscyamine's effects on gastrointestinal motility and gastric emptying, absorption of other oral medications may be decreased during concurrent use with this combination medication.

Urinary alkalizers and thiazide diuretics:  May cause the urine to become alkaline reducing the effectiveness of methenamine by inhibiting its conversion to formaldehyde.

Antimuscarinics:  Concurrent use may intensify antimuscarinic effects of atropine and hyoscyamine because of secondary antimuscarinic activities of these medications.

Antacids/antidiarrheals:  Concurrent use may reduce absorption of atropine and hyoscyamine resulting in decreased therapeutic effectiveness. Concurrent use with antacids may cause urine to become alkaline reducing the effectiveness of methenamine by inhibiting its conversion to formaldehyde. Doses of these medications should be spaced 1 hour apart from doses of atropine and hyoscyamine.

Antimyasthenics:  Concurrent use with atropine and hyoscyaminemay further reduce intestinal motility, therefore, caution is recommended.

Ketoconazole-atropine and hyoscyamine may cause increased gastrointestinal pH.

Concurrent administration with atropine and hyoscyamine may result in marked reduction in the absorption of ketoconazole. Patients should be advised to take this combination at least 2 hours after ketoconazole.

Monoamine oxidase (MAO) inhibitors:  Concurrent use with atropine and hyoscyamine may intensify antimuscarinic side effects.

Opioid (narcotic) analgesics may result in increased risk of severe constipation.

Sulfonamides:  These drugs may precipitate with formaldehyde in the urine increasing the danger of crystalluria.

Patients should be advised that the urine and/or stools may become blue to blue-green as a result of the excretion of methylene blue.

Adverse Reactions

Cardiovascular —rapid pulse, flushing

Central Nervous System —blurred vision, dizziness

Respiratory —shortness of breath or troubled breathing

Genitourinary —difficult micturition, acute urinary retention

Gastrointestinal —dry mouth, nausea/vomiting


A dependence on the use of PROSED EC has not been reported and due to the nature of its ingredients, abuse of PROSED EC is not expected.


Emesis or gastric lavage. Slow intravenous administration of physostigmine in doses of 1 to 4 mg (0.5 to 1 mg in children) repeated as needed in one to two hours to reverse severe antimuscarinic symptoms. Administration of small doses of diazepam to control excitement and seizures. Artificial respiration with oxygen if needed for respiratory depression. Adequate hydration. Symptomatic treatment as necessary.

Dosage and Administration

Adults:   One tablet orally 4 times per day followed by liberal fluid intake.

Older children:   Dosage must be individualized by physician. Not recommended for use in children up to 12 years of age.

How Supplied

Round, deep blue, sugar-coated tablets imprinted with " PROSED EC ". Bottles of 90


Store in a dry place between 15° and 30°C (59° to 86° F).

Keep container tightly closed. Code#STA108-031 Rev. 4/04


1 (800) 845-7827

FAX (954) 971-7718


Manufactured For:


Fort Lauderdale, FL 33315

Manufactured By:


Hauppage, NY 11788