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Urogesic Blue (Methenamine / Sodium Phosphate, Monobasic / Methylene Blue / Hyoscyamine Sulfate) - Description and Clinical Pharmacology


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Each tablet contains:

Methenamine, USP 81.6 mg
Monobasic Sodium Phosphate, USP 40.8 mg
Methylene Blue, USP 10.8 mg
Hyoscyamine Sulfate, USP 0.12 mg

Inactive Ingredients include: microcrystalline cellulose, NF, mannitol, USP, croscarmellose sodium, NF, magnesium stearate, NF and lake blend blue.

HYOSCYAMINE SULFATE is an alkaloid of belladonna. Exists as a white crystalline powder. Affected by light It is very soluble in water; freely soluble in alcohol; practically insoluble in ether.

METHENAMINE 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.

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

MONOBASIC SODIUM PHOSPHATE exists as a white crystalline powder. Its solutions are acidic to litmus. It is freely soluble in water and practically insoluble in alcohol.


HYOSCYAMINE is a parasympatholytic which relaxes smooth muscles and thus produces an antispasmodic effect. It is well absorbed from the gastrointestinal tract and is rapidly distributed throughout body tissues. Most is excreted in the urine within 12 hours, 13% to 50% being unchanged. Its biotransformation is hepatic. Its protein binding is moderate.

METHENAMINE degrades in an acidic urine environment releasing formaldehyde which provides bactericidal or bacteriostatic action. It is well absorbed from the gastrointestinal tract. 70% to 90% reaches the urine unchanged at which point it is hydrolyzed if the urine is acidic. Within 24 hours it is almost completely (90%) excreted; of this amount at pH 5, approximately 20% is formaldehyde. Protein binding: some formaldehyde is bound to substances in the urine and surrounding tissues. Methenamine is freely distributed to body tissue and fluids but is not clinically significant as it does not hydrolyze at pH greater than 6.8.

METHYLENE BLUE possesses weak antiseptic properties. It is well absorbed in the gastrointestinal tract and is rapidly reduced to leukomethylene blue which is stabilized in some combination form in the urine. 75% is excreted unchanged.

MONOBASIC SODIUM PHOSPHATE helps to maintain an acid pH in the urine necessary for the degradation of methenamine.

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