Many medications can cause side effects. A side effect is an unwanted response to a medication when it is taken in normal doses. Side effects can be mild or severe, temporary or permanent. The side effects listed below are not experienced by everyone who takes Uromax (Oxybutynin). If you are concerned about side effects, discuss the risks and benefits of Uromax (Oxybutynin) with your doctor.

The following side effects have been reported by at least 1% of people taking this medication. Many of these side effects can be managed, and some may go away on their own over time.

Contact your doctor if you experience these side effects and they are severe or bothersome. Your pharmacist may be able to advise you on managing side effects.

Although most of these side effects listed below don't happen very often, they could lead to serious problems if you do not check with your doctor or seek medical attention.

Check with your doctor as soon as possible if any of the following side effects occur:

• back or joint pain
• confusion
• nervousness
• signs of heart rhythm disturbances such as dizziness or palpitations (sensation of rapid, pounding, or irregular heartbeat)
• signs of Depression (e.g., poor concentration, changes in weight, changes in sleep, decreased interest in activities, thoughts of suicide)
• signs of urinary tract infection (e.g., burning when passing urine, blood in the urine, or increased urgency to urinate)
• swelling of the hands and feet
• symptoms of increased blood pressure (e.g., headache, vision problems,  dizziness, shortness of breath)
• unusual weakness

Stop taking the medication and seek immediate medical attention if any of the following occur:

• feeling agitated or behaving irrationally
• hallucinations
• seizures

• signs and symptoms of a Anaphylaxis (severe allergic reaction) (e.g., Hives; itchy skin; difficulty breathing or swallowing; swelling of the face, throat, or tongue)
• symptoms of a severe skin reaction (e.g., rash, red skin, blisters, peeling, Fever)

Some people may experience side effects other than those listed. Check with your doctor if you notice any symptom that worries you while you are taking Uromax (Oxybutynin).

Do not take Uromax (Oxybutynin) if you:

• are allergic to Uromax (Oxybutynin) or to any of the ingredients of the medication
• have acute blood loss that compromises the heart or circulation
• have difficulty starting urine flow (urinary retention) or are at risk for this condition
• have intestinal atony (loss of tone of intestinal muscles) due to aging or debilitation
• have megacolon (dilated large intestine)
• have Myasthenia Gravis
• have narrow-angle Glaucoma or are at risk for it
• have obstructive uropathy (blocked urine flow)
• have paralytic ileus (a condition that causes complete or partial blockage of the bowel)
• have partial or complete obstruction of the gastrointestinal tract or are at risk for it

There may be an interaction between Uromax (Oxybutynin) and any of the following:

If you are taking any of these, speak with your doctor or pharmacist. Depending on your specific circumstances, your doctor may want you to:

• stop taking one of the medications,
• change one of the medications to another,
• change how you are taking one or both of the medications, or
• leave everything as is.

An interaction between two medications does not always mean that you must stop taking one of them. Speak to your doctor about how any drug interactions are being managed or should be managed.

Medications other than those listed above may interact with this medication. Tell your doctor or prescriber about all prescription, over-the-counter (non-prescription), and herbal medications that you are taking. Also tell them about any supplements you take. Since caffeine, alcohol, the Nicotine from cigarettes, or street drugs can affect the action of many medications, you should let your prescriber know if you use them.

Before you begin using a medication, be sure to inform your doctor of any medical conditions or Allergies you may have, any medications you are taking, whether you are pregnant or breast-feeding, and any other significant facts about your health. These factors may affect how you should use this medication.

Drowsiness/blurred vision: Uromax (Oxybutynin) may cause drowsiness or blurred vision. Avoid activities requiring mental alertness, such as driving, operating machinery, or performing hazardous work, while taking Uromax (Oxybutynin) until you are certain that your ability to perform these tasks is not impaired by Uromax (Oxybutynin). Alcohol and other medications that cause drowsiness may increase the drowsiness caused by Uromax (Oxybutynin).

Gastrointestinal disorders: Uromax (Oxybutynin) can worsen gastroesophageal reflux caused by hiatus Hernia and can cause serious intestinal problems for people with Ulcerative Colitis. If you have a disorder involving the digestive system, discuss with your doctor how Uromax (Oxybutynin) may affect your medical condition, how your medical condition may affect the dosing and effectiveness of Uromax (Oxybutynin), and whether any special monitoring is needed.

Heart conditions: The symptoms of heart disease, heart failure, abnormal heart rhythms, and high blood pressure can be aggravated by Uromax (Oxybutynin). Also, Uromax (Oxybutynin) may cause or worsen a heart rhythm problem called QT prolongation. If you are at risk of developing QT prolongation, your doctor will monitor you closely. If you experience symptoms such as dizziness, palpitations, or fainting, stop taking Uromax (Oxybutynin) and seek immediate medical attention.

Heat Stroke: Uromax (Oxybutynin) causes a decrease in sweating, which is one of the body's way of cooling off. When Uromax (Oxybutynin) is taken during very hot weather, it can cause fever and Heat Stroke due to the body being unable to cool down enough. Take care not to overheat when you are taking this medication. Stay in a cool environment if possible, limit the length of time you spend outdoors, and drink plenty of water to reduce the risk of heat stroke.

Kidney function: If you have reduced kidney function or Kidney Disease, discuss with your doctor how Uromax (Oxybutynin) may affect your medical condition, how your medical condition may affect the dosing and effectiveness of Uromax (Oxybutynin), and whether any special monitoring is needed.

Liver function: If you have reduced liver function or liver disease, discuss with your doctor how Uromax (Oxybutynin) may affect your medical condition, how your medical condition may affect the dosing and effectiveness of this medication, and whether any special monitoring is needed.

Prostate enlargement: The symptoms of prostate enlargement may be worsened by Uromax (Oxybutynin). If you have prostate enlargement or another problem involving the prostate gland, discuss with your doctor how Uromax (Oxybutynin) may affect your medical condition, how your medical condition may affect the dosing and effectiveness of Uromax (Oxybutynin), and whether any special monitoring is needed.

Thyroid problems: The symptoms of overactive thyroid may be worsened by Uromax (Oxybutynin). If you have an overactive thyroid, discuss with your doctor how this medication may affect your medical condition, how your medical condition may affect the dosing and effectiveness of Uromax (Oxybutynin), and whether any special monitoring is needed.

Pregnancy: Uromax (Oxybutynin) should not be used during pregnancy unless the benefits outweigh the risks. If you become pregnant while taking Uromax (Oxybutynin), contact your doctor immediately.

Breast-feeding: It is not known if Uromax (Oxybutynin) passes into breast milk. If you are a breast-feeding mother and are taking Uromax (Oxybutynin), it may affect your baby. Talk to your doctor about whether you should continue breast-feeding.

Children: The safety and effectiveness of using Uromax (Oxybutynin) have not been established for children.

Seniors: Seniors may be at increased risk of side effects when taking Uromax (Oxybutynin). A lower dose may be necessary.