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.

The most common adverse reaction with adalimumab was injection site reactions. In placebo-controlled trials, 20% of subjects treated with adalimumab developed injection site reactions (erythema and/or itching, hemorrhage, pain or swelling), compared to 14% of subjects receiving placebo. Most injection site reactions were described as mild and generally did not necessitate drug discontinuation.

The proportion of subjects who discontinued treatment due to adverse reactions during the double-blind, placebo-controlled portion of studies in subjects with RA (i.e., Studies RA-I, RA-II, RA-III and RA-IV) was 7% for subjects taking adalimumab and 4% for placebo-treated subjects. The most common adverse reactions leading to discontinuation of adalimumab in these RA studies were clinical flare reaction (0.7%), rash (0.3%) and pneumonia (0.3%).

In the controlled portions of the 39 global adalimumab clinical trials in adult subjects with RA, PsA, AS, CD, UC, Ps, HS and UV, the rate of serious infections was 4.3 per 100 patient-years in 7973 adalimumab-treated subjects versus a rate of 2.9 per 100 patient-years in 4848 control-treated subjects. Serious infections observed included pneumonia, septic arthritis, prosthetic and post-surgical infections, erysipelas, cellulitis, diverticulitis, and pyelonephritis

In 52 global controlled and uncontrolled clinical trials in RA, PsA, AS, CD, UC, Ps, HS and UV that included 24,605 adalimumab-treated subjects, the rate of reported active tuberculosis was 0.20 per 100 patient-years and the rate of positive PPD conversion was 0.09 per 100 patient-years. In a subgroup of 10,113 U.S. and Canadian adalimumab-treated subjects, the rate of reported active TB was 0.05 per 100 patient-years and the rate of positive PPD conversion was 0.07 per 100 patient-years. These trials included reports of miliary, lymphatic, peritoneal, and pulmonary TB. Most of the TB cases occurred within the first eight months after initiation of therapy and may reflect recrudescence of latent disease. In these global clinical trials, cases of serious opportunistic infections have been reported at an overall rate of 0.05 per 100 patient-years. Some cases of

In the rheumatoid arthritis controlled trials, 12% of subjects treated with adalimumab and 7% of placebo-treated subjects that had negative baseline ANA titers developed positive titers at week 24. Two subjects out of 3046 treated with adalimumab developed clinical signs suggestive of new-onset lupus-like syndrome. The subjects improved following discontinuation of therapy. No subjects developed lupus nephritis or central nervous system symptoms. The impact of long-term treatment with adalimumab products on the development of autoimmune diseases is unknown.

There have been reports of severe hepatic reactions including acute liver failure in subjects receiving TNF-blockers. In controlled Phase 3 trials of adalimumab (40 mg SC every other week) in subjects with RA, PsA, and AS with control period duration ranging from 4 to 104 weeks, ALT elevations ≥3 x ULN occurred in 3.5% of adalimumab-treated subjects and 1.5% of control-treated subjects. Since many of these subjects in these trials were also taking medications that cause liver enzyme elevations (e.g., NSAIDS, MTX), the relationship between adalimumab and the liver enzyme elevations is not clear. In a controlled Phase 3 trial of adalimumab in subjects with polyarticular JIA who were 4 to 17 years, ALT elevations ≥3 x ULN occurred in 4.4% of adalimumab-treated subjects and 1.5% of control-treated subjects (ALT more common than AST); liver enzyme test elevations were more frequent among those treated with the combination of adalimumab and MTX than those treated with adalimumab alone. In general, these elevations did not lead to discontinuation of adalimumab treatment. No ALT elevations ≥3 x ULN occurred in the open-label study of adalimumab in subjects with polyarticular JIA who were 2 to <4 years.

In controlled Phase 3 trials of adalimumab (initial doses of 160 mg and 80 mg, or 80 mg and 40 mg on Days 1 and 15, respectively, followed by 40 mg every other week) in adult subjects with Crohn’s Disease with a control period duration ranging from 4 to 52 weeks, ALT elevations ≥3 x ULN occurred in 0.9% of adalimumab-treated subjects and 0.9% of control-treated subjects. In the Phase 3 trial of adalimumab in pediatric subjects with Crohn’s disease which evaluated efficacy and safety of two body weight based maintenance dose regimens following body weight based induction therapy up to 52 weeks of treatment, ALT elevations ≥3 x ULN occurred in 2.6% (5/192) of subjects, of whom 4 were receiving concomitant immunosuppressants at baseline; none of these subjects discontinued due to abnormalities in ALT tests. In controlled Phase 3 trials of adalimumab (initial doses of 160 mg and 80 mg on Days 1 and 15 respectively, followed by 40 mg every other week) in adult subjects with UC with control period duration ranging from 1 to 52 weeks, ALT elevations ≥3 x ULN occurred in 1.5% of adalimumab-treated subjects and 1.0% of control-treated subjects. In controlled Phase 3 trials of adalimumab (initial dose of 80 mg then 40 mg every other week) in subjects with Ps with control period duration ranging from 12 to 24 weeks, ALT elevations ≥3 x ULN occurred in 1.8% of adalimumab-treated subjects and 1.8% of control-treated subjects. In controlled trials of adalimumab (initial doses of 160 mg at Week 0 and 80 mg at Week 2, followed by 40 mg every week starting at Week 4), in subjects with HS with a control period duration ranging from 12 to 16 weeks, ALT elevations ≥ 3 x ULN occurred in 0.3% of adalimumab-treated subjects and 0.6% of control-treated subjects. In controlled trials of adalimumab (initial doses of 80 mg at Week 0 followed by 40 mg every other week starting at Week 1) in adult subjects with uveitis with an exposure of 165.4 PYs and 119.8 PYs in adalimumab-treated and control-treated subjects, respectively, ALT elevations ≥ 3 x ULN occurred in 2.4% of adalimumab-treated subjects and 2.4% of control-treated subjects.

The data described below reflect exposure to adalimumab in 2468 subjects, including 2073 exposed for 6 months, 1497 exposed for greater than one year and 1380 in adequate and well-controlled studies (Studies RA-I, RA-II, RA-III, and RA-IV). Adalimumab was studied primarily in placebo-controlled trials and in long-term follow up studies for up to 36 months duration. The population had a mean age of 54 years, 77% were female, 91% were Caucasian and had moderately to severely active rheumatoid arthritis. Most subjects received 40 mg adalimumab every other week

Table 1 summarizes reactions reported at a rate of at least 5% in subjects treated with adalimumab 40 mg every other week compared to placebo and with an incidence higher than placebo. In Study RA-III, the types and frequencies of adverse reactions in the second year open-label extension were similar to those observed in the one-year double-blind portion.

Other infrequent serious adverse reactions that do not appear in the Warnings and Precautions or Adverse Reaction sections that occurred at an incidence of less than 5% in adalimumab-treated subjects in RA studies (RA-I, RA-II, RA-III, and RA-IV) were:

In general, the adverse reactions in the adalimumab-treated subjects in the polyarticular juvenile idiopathic arthritis (JIA) trials (Studies JIA-I and JIA-II)

In Study JIA-I, adalimumab was studied in 171 subjects who were 4 to 17 years of age, with polyarticular JIA. Severe adverse reactions reported in the study included neutropenia, streptococcal pharyngitis, increased aminotransferases, herpes zoster, myositis, metrorrhagia, and appendicitis. Serious infections were observed in 4% of subjects within approximately 2 years of initiation of treatment with adalimumab and included cases of herpes simplex, pneumonia, urinary tract infection, pharyngitis, and herpes zoster.

In Study JIA-I, 45% of subjects experienced an infection while receiving adalimumab with or without concomitant MTX in the first 16 weeks of treatment. The types of infections reported in adalimumab-treated subjects were generally similar to those commonly seen in polyarticular JIA subjects who are not treated with TNF blockers. Upon initiation of treatment, the most common adverse reactions occurring in this population treated with adalimumab were injection site pain and injection site reaction (19% and 16%, respectively). A less commonly reported adverse event in subjects receiving adalimumab was granuloma annulare which did not lead to discontinuation of adalimumab treatment.

In the first 48 weeks of treatment in Study JIA-I, non-serious hypersensitivity reactions were seen in approximately 6% of subjects and included primarily localized allergic hypersensitivity reactions and allergic rash.

In Study JIA-I, 10% of subjects treated with adalimumab who had negative baseline anti-dsDNA antibodies developed positive titers after 48 weeks of treatment. No subject developed clinical signs of autoimmunity during the clinical trial.

Approximately 15% of subjects treated with adalimumab developed mild-to-moderate elevations of creatine phosphokinase (CPK) in Study JIA-I. Elevations exceeding 5 times the upper limit of normal were observed in several subjects. CPK concentrations decreased or returned to normal in all subjects. Most subjects were able to continue adalimumab without interruption.

In Study JIA-II, adalimumab was studied in 32 subjects who were 2 to <4 years of age or 4 years of age and older weighing <15 kg with polyarticular JIA. The safety profile for this population was similar to the safety profile seen in subjects 4 to 17 years of age with polyarticular JIA.

In Study JIA-II, 78% of subjects experienced an infection while receiving adalimumab. These included nasopharyngitis, bronchitis, upper respiratory tract infection, otitis media, and were mostly mild to moderate in severity. Serious infections were observed in 9% of subjects receiving adalimumab in the study and included dental caries, rotavirus gastroenteritis, and varicella.

In Study JIA-II, non-serious allergic reactions were observed in 6% of subjects and included intermittent urticaria and rash, which were all mild in severity.

Adalimumab has been studied in 395 subjects with psoriatic arthritis (PsA) in two placebo-controlled trials and in an open label study and in 393 subjects with ankylosing spondylitis (AS) in two placebo-controlled studies

During the 4-week open label induction phase of Study PCD-I, the most common adverse reactions occurring in the pediatric population treated with adalimumab were injection site pain and injection site reaction (6% and 5%, respectively).

A total of 67% of children experienced an infection while receiving adalimumab in Study PCD-I. These included upper respiratory tract infection and nasopharyngitis.

A total of 5% of children experienced a serious infection while receiving adalimumab in Study PCD-I. These included viral infection, device related sepsis (catheter), gastroenteritis, H1N1 influenza, and disseminated histoplasmosis.

In Study PCD-I, allergic reactions were observed in 5% of children which were all non-serious and were primarily localized reactions.

Adalimumab has been studied in 1696 subjects with plaque psoriasis (Ps) in placebo-controlled and open-label extension studies

Adalimumab has been studied in 727 subjects with hidradenitis suppurativa (HS) in three placebo-controlled studies and one open-label extension study

Flare of HS, defined as ≥25% increase from baseline in abscesses and inflammatory nodule counts and with a minimum of 2 additional lesions, was documented in 22 (22%) of the 100 subjects who were withdrawn from adalimumab treatment following the primary efficacy timepoint in two studies.

Adalimumab has been studied in 464 adult subjects with uveitis (UV) in placebo-controlled and open-label extension studies and in 90 pediatric subjects with uveitis (Study PUV-I)

The observed incidence of anti-drug antibodies is highly dependent on the sensitivity and specificity of the assay. Differences in assay methods preclude meaningful comparisons of the incidence of anti-drug antibodies in the studies described below with the incidence of anti-drug antibodies in other studies, including those of adalimumab or of other adalimumab products.

There are two assays that have been used to measure anti-adalimumab antibodies. With the ELISA, antibodies to adalimumab could be detected only when serum adalimumab concentrations were <2 mcg/mL. The ECL assay can detect anti-adalimumab antibody titers independent of adalimumab concentrations in the serum samples. The incidence of anti-adalimumab antibody (AAA) development in patients treated with adalimumab are presented in Table 2.

The following adverse reactions have been identified during post-approval use of adalimumab products. 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 adalimumab products exposure.