Myrbetriq

Last updated on RxList: 4/1/2021
Myrbetriq Side Effects Center

Medical Editor: John Cunha, DO, FACOEP

What Is Myrbetriq?

Myrbetriq (mirabegron) is a beta-3 adrenergic agonist used to treat overactive bladder (OAB) with symptoms of urge urinary incontinence, urgency, and urinary frequency.

What Are Side Effects of Myrbetriq?

Side effects of Myrbetriq include

Tell your doctor if you experience serious side effects of Myrbetriq including

  • fast or pounding heartbeats,
  • pain or burning when you urinate,
  • difficulty urinating,
  • trouble emptying your bladder,
  • or
  • dangerously high blood pressure (severe headache,
  • buzzing in your ears,
  • anxiety,
  • confusion,
  • chest pain,
  • shortness of breath,
  • uneven heartbeats,
  • seizures).

Dosage for Myrbetriq

The recommended starting dose of Myrbetriq is 25 mg once daily, with or without food. 25 mg is effective within 8 weeks, though the dose may be increased to 50 mg once daily. Myrbetriq should be swallowed whole and should not be crushed, divided or chewed.

What Drugs, Substances, or Supplements Interact with Myrbetriq?

Myrbetriq may interact with metoprolol, desipramine, or digoxin. Tell your doctor all medications you use.

Myrbetriq During Pregnancy and Breastfeeding

During pregnancy, Myrbetriq should be used only if the benefit to the mother outweighs the potential risk to the fetus. Myrbetriq passes into milk and is not recommended for use while breastfeeding.

Additional Information

Our Myrbetriq Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

SLIDESHOW

Urinary Incontinence in Women: Types, Causes, and Treatments for Bladder Control See Slideshow
Myrbetriq Consumer Information

Stop using mirabegron and get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have:

  • pain or burning when you urinate; or
  • dangerously high blood pressure--severe headache, blurred vision, pounding in your neck or ears.

Common side effects may include:

  • painful urination;
  • increased blood pressure;
  • sinus pain, sore throat;
  • constipation;
  • headache; or
  • dry mouth or fast heartbeats (when taken with solifenacin).

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Read the entire detailed patient monograph for Myrbetriq (Mirabegron)

Myrbetriq Professional Information

SIDE EFFECTS

The following adverse reactions are discussed in more detail in other sections of the labeling.

  • Hypertension [see WARNINGS AND PRECAUTIONS]
  • Urinary Retention [see WARNINGS AND PRECAUTIONS]
  • Angioedema [see WARNINGS AND PRECAUTIONS]

Clinical Trials Experience

Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in clinical practice.

MYRBETRIQ Monotherapy For Adult OAB

In three, 12-week, double-blind, placebo-controlled, safety and efficacy studies in patients with OAB (Studies 1, 2, and 3), MYRBETRIQ was evaluated for safety in 2736 patients [see Clinical Studies]. Study 1 also included an active control. For the combined Studies 1, 2, and 3, 432 patients received MYRBETRIQ 25 mg, 1375 received MYRBETRIQ 50 mg, and 929 received MYRBETRIQ 100 mg once daily. In these studies, the majority of the patients were Caucasian (94%) and female (72%) with a mean age of 59 years (range 18 to 95 years).

MYRBETRIQ was also evaluated for safety in 1632 patients who received MYRBETRIQ 50 mg once daily (n=812 patients) or MYRBETRIQ 100 mg (n=820 patients) in a 1-year, randomized, fixed-dose, double-blind, active-controlled, safety study in patients with OAB (Study 4). Of these patients, 731 received MYRBETRIQ in a previous 12week study. In Study 4, 1385 patients received MYRBETRIQ continuously for at least 6 months, 1311 patients received MYRBETRIQ for at least 9 months, and 564 patients received MYRBETRIQ for at least 1 year.

The most frequent adverse events (0.2%) leading to discontinuation in Studies 1, 2, and 3 for the 25 mg or 50 mg dose were nausea, headache, hypertension, diarrhea, constipation, dizziness, and tachycardia.

Atrial fibrillation (0.2%) and prostate cancer (0.1%) were reported as serious adverse events by more than 1 patient and at a rate greater than placebo.

Table 8 lists the adverse reactions, derived from all adverse events, that were reported in Studies 1, 2, and 3 at an incidence greater than placebo and in 1% or more of patients treated with MYRBETRIQ 25 mg or 50 mg once daily for up to 12 weeks. The most commonly reported adverse reactions (greater than 2% of MYRBETRIQ patients and greater than placebo) were hypertension, nasopharyngitis, urinary tract infection, and headache.

Table 8: Percentages of Patients with Adverse Reactions, Derived from All Adverse Events, Exceeding Placebo Rate and Reported in ≥ 1% of OAB Patients Treated with MYRBETRIQ 25 mg or 50 mg Once Daily in Studies 1, 2, and 3

Adverse Reaction Placebo
(%)
MYRBETRIQ 25 mg
(%)
MYRBETRIQ 50 mg
(%)
Number of Patients 1380 432 1375
Hypertension1 7.6 11.3 7.5
Nasopharyngitis 2.5 3.5 3.9
Urinary Tract Infection 1.8 4.2 2.9
Headache 3.0 2.1 3.2
Constipation 1.4 1.6 1.6
Upper Respiratory Tract Infection 1.7 2.1 1.5
Arthralgia 1.1 1.6 1.3
Diarrhea 1.3 1.2 1.5
Tachycardia 0.6 1.6 1.2
Abdominal Pain 0.7 1.4 0.6
Fatigue 1.0 1.4 1.2
1 Includes reports of blood pressure above the normal range, and BP increased from baseline, occurring predominantly in subjects with baseline hypertension.

Other adverse reactions reported by less than 1% of patients treated with MYRBETRIQ in Studies 1, 2, or 3 included:

Cardiac disorders: palpitations, blood pressure increased [see CLINICAL PHARMACOLOGY]

Eye disorders: glaucoma [see CLINICAL PHARMACOLOGY]

Gastrointestinal disorders: dyspepsia, gastritis, abdominal distension

Infections and Infestations: sinusitis, rhinitis

Investigations: GGT increased, AST increased, ALT increased, LDH increased

Renal and urinary disorders: nephrolithiasis, bladder pain

Reproductive system and breast disorders: vulvovaginal pruritus, vaginal infection

Skin and subcutaneous tissue disorders: urticaria, leukocytoclastic vasculitis, rash, pruritus, purpura, lip edema

Table 9 lists the rates of the most commonly reported adverse reactions, derived from all adverse events in patients treated with MYRBETRIQ 50 mg for up to 52 weeks in Study 4. The most commonly reported adverse reactions (> 3% of MYRBETRIQ patients) were hypertension, urinary tract infection, headache, and nasopharyngitis.

Table 9: Percentages of Patients with Adverse Reactions, Derived from All Adverse Events, Reported in > 2% of OAB Patients Treated with MYRBETRIQ 50 mg Once Daily in Study 4

Adverse Reaction MYRBETRIQ 50 mg
(%)
Active Control
(%)
Number of Patients 812 812
Hypertension 9.2 9.6
Urinary Tract Infection 5.9 6.4
Headache 4.1 2.5
Nasopharyngitis 3.9 3.1
Back Pain 2.8 1.6
Constipation 2.8 2.7
Dry Mouth 2.8 8.6
Dizziness 2.7 2.6
Sinusitis 2.7 1.5
Influenza 2.6 3.4
Arthralgia 2.1 2.0
Cystitis 2.1 2.3

In Study 4, in patients treated with MYRBETRIQ 50 mg once daily, adverse reactions leading to discontinuation reported by more than 2 patients and at a rate greater than active control included: constipation (0.9%), headache (0.6%), dizziness (0.5%), hypertension (0.5%), dry eyes (0.4%), nausea (0.4%), vision blurred (0.4%), and urinary tract infection (0.4%). Serious adverse events reported by at least 2 patients and exceeding active control included cerebrovascular accident (0.4%) and osteoarthritis (0.2%). Serum ALT/AST increased from baseline by greater than 10-fold in 2 patients (0.3%) taking MYRBETRIQ 50 mg; and these markers subsequently returned to baseline while both patients continued MYRBETRIQ.

In Study 4, serious adverse events of neoplasm were reported by 0.1%, 1.3%, and 0.5% of patients treated with MYRBETRIQ 50 mg, MYRBETRIQ 100 mg, and active control once daily, respectively. Neoplasms reported by 2 patients treated with MYRBETRIQ 100 mg included breast cancer, lung neoplasm malignant, and prostate cancer. A causal relationship between mirabegron and these reported neoplasms has not been established.

In a separate clinical study in Japan, a single case was reported as Stevens-Johnson syndrome with increased serum ALT, AST, and bilirubin in a patient taking MYRBETRIQ 100 mg as well as an herbal medication (Kyufu Gold).

MYRBETRIQ Combination Therapy With Solifenacin Succinate For Adult OAB

In three, 12-week, double-blind, randomized, active-controlled safety and efficacy studies in patients with OAB (Studies 5, 6, and 7), combination treatment of MYRBETRIQ and solifenacin succinate was evaluated for safety in 6818 patients [see Clinical Studies]. Studies 5 and 6 also included a placebo control. For the combined Studies 5, 6, and 7, 997 patients received combination treatment with MYRBETRIQ 25 mg and solifenacin succinate 5 mg, and 1706 patients received combination treatment with MYRBETRIQ 50 mg and solifenacin succinate 5 mg. In these studies, the majority of the patients were Caucasian (88%) and female (77%) with a mean age of 57 years (range 18 to 89 years).

MYRBETRIQ 50 mg and solifenacin succinate 5 mg coadministration was also evaluated for safety in 1814 patients in a 52-week, double-blind, randomized, active-controlled study in patients with OAB (Study 8) [see Clinical Studies].

In Studies 5, 6, and 7, the most commonly reported adverse reactions (greater than 2% of patients treated with combination therapy of MYRBETRIQ and solifenacin succinate 5 mg, and greater than placebo and/or MYRBETRIQ or solifenacin succinate comparator at the same dose as in the combination treatment) were dry mouth, urinary tract infection, constipation, and tachycardia. The most frequent adverse reactions (≥ 0.2%) leading to discontinuation in the coadministration trials were dry mouth and urinary retention.

Table 10 lists the adverse reactions, derived from all adverse events that were reported in Studies 5, 6, and 7 in 1% or more of patients treated with MYRBETRIQ 25 mg or 50 mg coadministered with solifenacin succinate 5 mg and at an incidence greater than placebo and mirabegron or solifenacin succinate comparator at the same dose as in the combination treatment when administered once daily for up to 12 weeks.

Table 10: Percentages of Patients with Adverse Reactions, Derived from All Adverse Events, Exceeding Placebo and Comparator (at same dose level) Rate and Reported in ≥ 1% of OAB Patients Treated with Combination Therapy in Studies 5, 6, and 71

Adverse Reaction Placebo
(%)
MYRBETRIQ
25 mg
(%)
MYRBETRIQ
50 mg
(%)
Solifenacin Succinate
5 mg
(%)
MYRBETRIQ
25 mg + Solifenacin Succinate
5 mg
(%)
MYRBETRIQ
50 mg + Solifenacin Succinate
5 mg1 (%)
Number of Patients 510 500 500 1288 997 1706
Dry Mouth 2.2 3.8 3.6 6.5 9.3 7.2
Urinary Tract Infections2 5.3 4.0 4.2 3.6 7.0 4.0
Constipation 1.2 1.2 2.8 2.4 4.2 3.9
Tachycardia 0.8 1.6 1.6 0.7 2.2 0.9
Dyspepsia 0.6 0.4 0.2 0.7 1.1 1.3
Dizziness 0.4 0.8 1.2 1.2 1.3 0.4
Vision Blurred 0.4 0.2 0.2 0.9 0.7 1.1
Arthralgia 0.8 0.8 0.8 0.8 0.5 1.1
1 Adverse reactions occurring in patients treated with coadministration of MYRBETRIQ and solifenacin succinate in Study 7, that included a 4-week initial treatment period with MYRBETRIQ 25 mg + Solifenacin Succinate 5 mg, are included in the MYRBETRIQ 50 mg + Solifenacin Succinate 5 mg group.
2 Includes any recorded treatment-emergent UTI.

In Study 8, the most common adverse reactions (more than 2% of patients treated with coadministration of MYRBETRIQ and solifenacin succinate and exceeding comparator rate) were UTI, dry mouth, constipation, and headache. The most frequent adverse reactions leading to discontinuation in the trial were constipation (0.2%), urinary retention (0.2%), urinary hesitation (0.2%), and vision blurred (0.2%).

In Study 8, serious adverse events of neoplasm were reported by 0.7%, 0.3%, and 0% of patients who received coadministration of MYRBETRIQ 50 mg and solifenacin succinate 5 mg, MYRBETRIQ 50 mg monotherapy, and solifenacin succinate 5 mg monotherapy, respectively. Neoplasms reported by more than 1 patient who received coadministration with MYRBETRIQ 50 mg and solifenacin succinate 5 mg included basal cell carcinoma (n=3), breast cancer (n=2), melanoma (n=2), and squamous cell carcinoma (n=2). A causal relationship between the coadministration of mirabegron and solifenacin succinate and these reported neoplasms has not been established.

Table 11 lists the adverse reactions, derived from all adverse events that were reported at an incidence greater than comparator and in 2% or more of patients treated with MYRBETRIQ 50 mg coadministered with solifenacin succinate 5 mg once daily for up to 52 weeks in Study 8.

Table 11: Percentages of Patients with Adverse Reactions, Derived from All Adverse Events, Exceeding Comparator Rate and Reported in ≥ 2% of OAB Patients Treated with Combination Therapy in Study 8

Adverse Reaction MYRBETRIQ
50 mg
(%)
Solifenacin Succinate
5 mg
(%)
MYRBETRIQ
50 mg + Solifenacin Succinate
5 mg
(%)
Number of Patients 305 303 1206
Urinary Tract Infections1 6.2 5.9 8.4
Dry Mouth 3.9 5.9 6.1
Constipation 1.0 2.3 3.3
Headache 1.6 1.7 2.9
1 Includes any recorded treatment-emergent UTI.

MYRBETRIQ/MYRBETRIQ Granules For Pediatric Neurogenic Detrusor Overactivity (NDO)

The safety of MYRBETRIQ/MYRBETRIQ Granules was evaluated in a 52-week, open-label, baseline-controlled, multicenter, dose titration study (Study 9) [see Clinical Studies]. The study included 86 pediatric patients 3 to 17 years of age with neurogenic detrusor overactivity (NDO); 55% were female, 72% were White. Treatment was initiated at the weight-based starting recommended dose and was increased to a dose equivalent of MYRBETRIQ 50 mg daily dose in adults by Week 8. Subsequent to the dose titration period, patients continued their optimized dose for the duration of the 52-week study (mean exposure duration 303 days, range 1 to 390 days).

The most commonly reported adverse reactions were UTI, nasopharyngitis, constipation, and headache.

Table 12 lists the adverse reactions that were reported in 2% or more of patients treated with MYRBETRIQ/MYRBETRIQ Granules for oral suspension in Study 9.

Table 12: Percentages of Patients with Adverse Reactions Reported in ≥ 2% of Patients 3 to 17 Years of Age with Neurogenic Detrusor Overactivity (NDO) Treated with MYRBETRIQ/MYRBETRIQ Granules in Study 9

Adverse Reaction Percentage (%) of Patients Reporting Adverse Reactions
N=86
Number of Patients 51 (59.3)
Urinary Tract Infection1 24.4
Nasopharyngitis 5.8
Constipation 4.7
Headache 3.5
Nausea 2.3
Gastroenteritis 2.3
Rhinitis 2.3
Cough 2.3
1 Includes any recorded UTI while patient was on treatment with MYRBETRIQ/MYRBETRIQ Granules.

Increased Blood Pressure In Pediatric Patients With NDO Treated With MYRBETRIQ/MYRBETRIQ Granules

Mean systolic and diastolic blood pressures increased in Study 9 by 4.3 mm Hg and 1.7 mm Hg, respectively, in patients less than 12 years of age on MYRBETRIQ/MYRBETRIQ Granules at a dose equivalent of MYRBETRIQ 50 mg daily dose in adults. The blood pressure increases were larger in patients less than 8 years of age with mean systolic and diastolic blood pressure increases of 5.9 mm Hg and 2.3 mm Hg, respectively. Ten (24%) patients less than 12 years of age who were normotensive at baseline had at least one blood pressure measured at or above the 95th percentile for age, sex, and stature during Study 9. Stage 1 hypertension, defined as repeated blood pressure measurements at or above the 95th percentile for age, sex, and stature, was sustained in six of these 10 patients (60%) at the end of the study.

Postmarketing Experience

The following adverse reactions have been identified during post-approval use of MYRBETRIQ/MYRBETRIQ Granules. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure. The following events have been reported in association with mirabegron use in worldwide postmarketing experience:

Cardiac disorders: atrial fibrillation

Gastrointestinal disorders: nausea, constipation, diarrhea

Nervous system disorders: dizziness, headache

There have been postmarketing reports of confusion, hallucinations, insomnia, and anxiety in patients taking mirabegron. The majority of these patients had pre-existing medical conditions or concomitant medications that may cause confusion, hallucinations, insomnia, and anxiety. A causal relationship between mirabegron and these disorders has not been established.

Skin and subcutaneous tissue disorders: angioedema of the face, lips, tongue, and larynx, with or without respiratory symptoms [see WARNINGS AND PRECAUTIONS]; pruritus

Renal and urinary disorders: urinary retention [see WARNINGS AND PRECAUTIONS]

DRUG INTERACTIONS

Drug interaction studies were conducted in adult patients to investigate the effect of coadministered drugs on the pharmacokinetics of mirabegron and the effect of mirabegron on the pharmacokinetics of coadministered drugs (e.g., ketoconazole, rifampin, solifenacin succinate, tamsulosin, and oral contraceptives) [see CLINICAL PHARMACOLOGY]. No dose adjustment is recommended when these drugs are coadministered with mirabegron.

The following are drug interactions for which monitoring is recommended:

Drugs Metabolized By CYP2D6

Since mirabegron is a moderate CYP2D6 inhibitor, the systemic exposure of drugs metabolized by CYP2D6 enzyme is increased when coadministered with mirabegron. Therefore, appropriate monitoring and dose adjustment may be necessary when MYRBETRIQ/MYRBETRIQ Granules is coadministered with these drugs, especially with narrow therapeutic index CYP2D6 substrates [see WARNINGS AND PRECAUTIONS and CLINICAL PHARMACOLOGY].

Digoxin

When given in combination, 100 mg mirabegron increased mean digoxin Cmax from 1.01 to 1.3 ng/mL (29%) and AUC from 16.7 to 19.3 ng.h/mL (27%). Concomitant administration of 0.25 mg digoxin with a combination of 5 mg solifenacin and 50 mg mirabegron increased digoxin AUCtau and Cmax by approximately 10% and 14%, respectively. For patients who are initiating a combination of mirabegron and digoxin, the lowest dose for digoxin should initially be considered. Serum digoxin concentrations should be monitored and used for titration of the digoxin dose to obtain the desired clinical effect [see CLINICAL PHARMACOLOGY].

Warfarin

The mean Cmax of S-and R-warfarin was increased by approximately 4% and AUC by approximately 9% when administered as a single dose of 25 mg after multiple doses of 100 mg mirabegron. Following a single dose administration of 25 mg warfarin, mirabegron had no effect on the warfarin pharmacodynamic endpoints such as International Normalized Ratio (INR) and prothrombin time. However, the effect of mirabegron on multiple doses of warfarin and on warfarin pharmacodynamic end points such as INR and prothrombin time has not been fully investigated [see CLINICAL PHARMACOLOGY].

Read the entire FDA prescribing information for Myrbetriq (Mirabegron)

© Myrbetriq Patient Information is supplied by Cerner Multum, Inc. and Myrbetriq Consumer information is supplied by First Databank, Inc., used under license and subject to their respective copyrights.

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