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The following serious adverse reactions are described elsewhere in the labeling:

  • Addiction, Abuse, and Misuse [see WARNINGS AND PRECAUTIONS]
  • Life-Threatening Respiratory Depression [see WARNINGS AND PRECAUTIONS]
  • QTc Prolongation [see WARNINGS AND PRECAUTIONS]
  • Neonatal Opioid Withdrawal Syndrome [see WARNINGS AND PRECAUTIONS]
  • Hypotensive Effects [see WARNINGS AND PRECAUTIONS]
  • Interactions with Other CNS Depressants [see WARNINGS AND PRECAUTIONS]
  • Application Site Skin Reactions [see WARNINGS AND PRECAUTIONS]
  • Anaphylactic/Allergic Reactions [see WARNINGS AND PRECAUTIONS]
  • Gastrointestinal Effects [see WARNINGS AND PRECAUTIONS]

Clinical Trial 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 practice.

A total of 5,415 patients were treated with BUTRANS in controlled and open-label chronic pain clinical trials. Nine hundred twenty-four subjects were treated for approximately six months and 183 subjects were treated for approximately one year. The clinical trial population consisted of patients with persistent moderate to severe pain.

The most common serious adverse drug reactions (all < 0.1%) occurring during clinical trials with BUTRANS were: chest pain, abdominal pain, vomiting, dehydration, and hypertension/blood pressure increased.

The most common adverse events ( ≥ 2%) leading to discontinuation were: nausea, dizziness, vomiting, headache, and somnolence.

The most common adverse reactions ( ≥ 5%) reported by patients in clinical trials comparing BUTRANS 10 or 20 mcg/hour to placebo are shown in Table 2, and comparing BUTRANS 20 mcg/hour to BUTRANS 5 mcg/hour are shown in Table 3 below:

Table 2: Adverse Reactions Reported in ≥ 5% of Patients during the Open-Label Titration Period and Double-Blind Treatment Period: Opioid-Naïve Patients

MedDRA Preferred Term Open-Label Titration Period Double-Blind Treatment Period
(N = 1024)
(N = 256)
Nausea 23% 13% 10%
Dizziness 10% 4% 1%
Headache 9% 5% 5%
Application site pruritus 8% 4% 7%
Somnolence 8% 2% 2%
Vomiting 7% 4% 1%
Constipation 6% 4% 1%

Table 3: Adverse Reactions Reported in ≥ 5% of Patients during the Open-Label Titration Period and Double-Blind Treatment Period: Opioid-Experienced Patients

MedDRA Preferred Term Open-Label Titration Period Double-Blind Treatment Period
(N = 1160)
(N = 219)
(N = 221)
Nausea 14% 11% 6%
Application site pruritus 9% 13% 5%
Headache 9% 8% 3%
Somnolence 6% 4% 2%
Dizziness 5% 4% 2%
Constipation 4% 6% 3%
Application site erythema 3% 10% 5%
Application site rash 3% 8% 6%
Application site irritation 2% 6% 2%

The following table lists adverse reactions that were reported in at least 2.0% of patients in four placebo/active-controlled titration-to-effect trials.

Table 4: Adverse Reactions Reported in Titration-to-Effect Placebo/Active-Controlled Clinical Trials with Incidence ≥ 2%

MedDRA Preferred Term BUTRANS
(N = 392)
(N = 261)
Nausea 21% 6%
Application site pruritus 15% 12%
Dizziness 15% 7%
Headache 14% 9%
Somnolence 13% 4%
Constipation 13% 5%
Vomiting 9% 1%
Application site erythema 7% 2%
Application site rash 6% 6%
Dry mouth 6% 2%
Fatigue 5% 1%
Hyperhidrosis 4% 1%
Peripheral edema 3% 1%
Pruritus 3% 0%
Stomach discomfort 2% 0%

The adverse reactions seen in controlled and open-label studies are presented below in the following manner: most common ( ≥ 5%), common ( ≥ 1% to < 5%), and less common ( < 1%).

The most common adverse reactions ( ≥ 5%) reported by patients treated with BUTRANS in the clinical trials were nausea, headache, application site pruritus, dizziness, constipation, somnolence, vomiting, application site erythema, dry mouth, and application site rash.

The common ( ≥ 1% to < 5%) adverse reactions reported by patients treated with BUTRANS in the clinical trials organized by MedDRA (Medical Dictionary for Regulatory Activities) System Organ Class were:

Gastrointestinal disorders: diarrhea, dyspepsia, and upper abdominal pain

General disorders and administration site conditions: fatigue, peripheral edema, application site irritation, pain, pyrexia, chest pain, and asthenia

Infections and infestations: urinary tract infection, upper respiratory tract infection, nasopharyngitis, influenza, sinusitis, and bronchitis

Injury, poisoning and procedural complications: fall

Metabolism and nutrition disorders: anorexia

Musculoskeletal and connective tissue disorders: back pain, arthralgia, pain in extremity, muscle spasms, musculoskeletal pain, joint swelling, neck pain, and myalgia

Nervous system disorders: hypoesthesia, tremor, migraine, and paresthesia

Psychiatric disorders: insomnia, anxiety, and depression

Respiratory, thoracic and mediastinal disorders: dyspnea, pharyngolaryngeal pain, and cough

Skin and subcutaneous tissue disorders: pruritus, hyperhidrosis, rash, and generalized pruritus

Vascular disorders: hypertension

Other less common adverse reactions, including those known to occur with opioid treatment, that were seen in < 1% of the patients in the BUTRANS trials include the following in alphabetical order:

Abdominal distention, abdominal pain, accidental injury, affect lability, agitation, alanine aminotransferase increased, angina pectoris, angioedema, apathy, application site dermatitis, asthma aggravated, bradycardia, chills, confusional state, contact dermatitis, coordination abnormal, dehydration, depersonalization, depressed level of consciousness, depressed mood, disorientation, disturbance in attention, diverticulitis, drug hypersensitivity, drug withdrawal syndrome, dry eye, dry skin, dysarthria, dysgeusia, dysphagia, euphoric mood, face edema, flatulence, flushing, gait disturbance, hallucination, hiccups, hot flush, hyperventilation, hypotension, hypoventilation, ileus, insomnia, libido decreased, loss of consciousness, malaise, memory impairment, mental impairment, mental status changes, miosis, muscle weakness, nervousness, nightmare, orthostatic hypotension, palpitations, psychotic disorder, respiration abnormal, respiratory depression, respiratory distress, respiratory failure, restlessness, rhinitis, sedation, sexual dysfunction, syncope, tachycardia, tinnitus, urinary hesitation, urinary incontinence, urinary retention, urticaria, vasodilatation, vertigo, vision blurred, visual disturbance, weight decreased, and wheezing.