Uribel Tabs Tablet, Coated
FDA Label NDC 0178-0745

Rx Only

100 Tablets

Uribel® Tabs for oral administration
Each tablet contains:
Methenamine ................................................................................................................................81.6 mg
Benzoic Acid ...................................................................................................................................9.0 mg
Phenyl Salicylate ...........................................................................................................................36.2 mg
Methylene Blue .............................................................................................................................10.8 mg
Hyoscyamine Sulfate.....................................................................................................................0.12 mg
HYOSCYAMINE SULFATE. [620-61-1][3(S)-endo]-α-(Hydroxymethyl)-benzeneacetic acid 8-methyl-8-azabicyclo[
3.2.1]oct-3-yl ester sulfate(2:1)(salt); 1αH, 5αH-tropan-3α-ol(-)- tropate(ester) sulfate(2:1)(salt); 3
α-tropanyl S-(-)-tropate; I-tropic acid ester with tropine; I-tropine tropate. C34H48N2O10S. Hyoscyamine
Sulfate is an alkaloid of belladonna. Exists as a white crystalline powder. Its solutions are alkaline to litmus.
Affected by light, it is slightly soluble in water; freely soluble in alcohol; sparingly soluble in ether.
METHENAMINE. [100-97-0] 1,3,5,7-Tetraazatricyclo [3.3.1.-1 3,7] decane; hexamethylenetetramine; HMT;
HMTA; hexamine; 1,3,5,7-tetraazaadamantane hexamethyleneimine; Uritone; Urotropin. C6H12N4; mol wt
140.19; C 51.40%, H 8.63%, N 39.96%. 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.
METHYLENE BLUE. [61-73-4] 3,7-Bis(dimethylamino) phenothiazin-5-ium chloride; C.I. Basic Blue 9;
methylthioninium chloride; tetramethylthionine chloride; 3,7-bis(dimethylamino) phenazathionium chloride.
C16H18ClN3S; mol wt 319.85, C 60.08%, H 5.67%, Cl 11.08%, N 13.14%, S 10.03%. Methylene Blue
(Methylthionine chloride) exists as dark green crystals. It is soluble in water and in chloroform; sparingly
soluble in alcohol.
PHENYL SALICYLATE. [118-55-8] 2-Hydroxybenzoic acid phenyl ester; Salol. C13H10O3; mol wt 214.22, C
72.89%, H 4.71%, O 22.41%. Made by the action of phosphorus oxychloride on a mixture of phenol and
salicylic acid. Phenyl Salicylate exists as white crystals with a melting point of 41°-43°C. It is very slightly
soluble in water and freely soluble in alcohol.
BENZOIC ACID. [65-85-0] Benzenecarboxylic acid; Benzeneformic acid; Benzenemethanoic acid. C7H6O2;
mol wt 122.12, C 68.85%, H 4.95%, O 26.20%. Exists as white powder or crystals, scales or needles. It has
a strong odor and is slightly soluble in alcohol; also soluble in volatile and fixed oils, slightly soluble in
petroleum ether.
Uribel Tabs contain inactive ingredients: Crospovidone, FD&C Blue #2, Magnesium Stearate, Microcrystalline
Cellulose, Polyethylene Glycol, Polyvinyl Alcohol, Rice Starch, Silicon Dioxide, Sodium Starch Glycolate,
Stearic Acid, Talc, and Titanium Dioxide.

HYOSCYAMINE SULFATE 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
the 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%-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 at a pH of 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 by the gastrointestinal tract and
rapidly reduced to leukomethylene blue which is stabilized in some combination form in the urine. 75% is
excreted unchanged.
PHENYL SALICYLATE releases salicylate, a mild analgesic for pain.
BENZOIC ACID helps maintain an acid pH in the urine necessary for the degradation of methenamine.

Uribel Tabs are indicated for the treatment of symptoms of irritative voiding. Indicated for the relief of local
symptoms, such as inflammation, hypermotility, and pain, which accompany lower urinary tract infections.
Indicated for the relief of urinary tract symptoms caused by diagnostic procedures.

Hypersensitivity to any of the ingredients is possible. Risk benefits should be carefully considered when the
following medical problems exist: cardiac disease (especially cardiac arrhythmias, congestive heart failure,
coronary heart disease, and mitral stenosis); gastrointestinal tract obstructive disease; glaucoma;
myasthenia gravis, acute urinary retention may be precipitated in obstructive uropathy (such as bladder neck
obstruction due to prostatic hypertrophy).

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 belladonna alkaloids or 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) - Hyoscyamine and methenamine cross the placenta.
Studies concerning the effect of hyoscyamine and methenamine on pregnancy and reproduction have not
been done in animals or humans. Thus, it is not known whether Uribel Tabs cause fetal harm when
administered to a pregnant woman or can affect reproduction capacity. Uribel Tabs should be given to a
pregnant woman only if clearly needed.

Breastfeeding - Problems in humans have not been documented; however, methenamine and traces of
hyoscyamine are excreted in breast milk. Accordingly, Uribel Tabs should be given to a nursing mother with
caution and only if clearly needed.
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 use - Infants and young children are especially susceptible to the toxic effect of the
belladonna alkaloids.
Geriatric use - Use with caution in elderly patients as they may respond to usual doses of hyoscyamine
with excitement, agitation, drowsiness or confusion.
ADVERSE REACTIONS:
Cardiovascular: rapid heartbeat, flushing
Central Nervous System: blurred vision, dizziness, drowsiness
Genitourinary: difficult micturition, acute urinary retention
Gastrointestinal: dry mouth, nausea and vomiting
Respiratory: shortness of breath or trouble breathing
Serious allergic reactions to this drug are rare. Seek immediate medical attention if you notice symptoms of
a serious allergic reaction, including itching, rash, severe dizziness, swelling or trouble breathing.
This medication can cause urine and sometimes stools to turn blue to blue-green. This effect is harmless
and will subside after medication is stopped.
Call your doctor or physician for medical advice about side effects. To report SUSPECTED ADVERSE
REACTIONS, contact Mission Pharmacal at 1-800-298-1087 or FDA at 1-800-FDA-1088,
www.fda.gov/medwatch.

Drug interactions - As a result of hyoscyamine's effects on gastrointestinal motility and gastric
emptying, absorption of other oral medications may be decreased during concurrent use with this
combination medication.
Methylene blue inhibits a range of CYP isozymes in vitro, including 1A2, 2B6, 2C8, 2C9, 2C19, 2D6 and
3A4/5. This interaction could be more pronounced with narrow therapeutic index drugs that are
metabolized by one of these enzymes (e.g., digoxin, warfarin, phenytoin, alfentanil, cyclosporine,
dihydroergotamine, ergotamine, fentanyl, pimozide, quinidine, sirolimus and tacrolimus). However, the
clinical relevance of these in vitro interactions is unknown.
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 hyoscyamine because of
secondary antimuscarinic activities of these medications.
Antacids/antidiarrheals: Concurrent use may reduce absorption of 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 hyoscyamine.
Antimyasthenics: Concurrent use with hyoscyamine may further reduce intestinal motility, therefore,
caution is recommended.
Ketoconazole and hyoscyamine may cause increased gastrointestinal pH. Concurrent administration with
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 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.

A dependence on the use of Uribel Tabs has not been reported and due to the nature of its ingredients,
abuse of Uribel Tabs 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.
If overdose is suspected, contact your local Poison Control Center or emergency room immediately.
US residents can contact the US National Poison Hotline at 1-800-222-1222.

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 six years of age or younger.

Uribel Tabs are blue tablets imprinted with “SAT” on one side and “109” on
opposite side.
NDC 0178-0745-01, bottle of 100 tablets.

Dispense in a tight, light-resistant container as defined in the USP/NF with a child-resistant
closure.
Store at controlled room temperature 20°-25°C (68°- 77°F).
Keep in a cool, dry place. Keep container tightly closed.
Keep this and all drugs out of reach of children.

Label (Uribel Label)

UBL030R1023

Distributed by:
MISSION PHARMACAL COMPANY
San Antonio, TX 78230 1355

R0823