SYMTUZA SIDE EFFECTS

  • Generic Name: darunavir, cobicistat, emtricitabine, and tenofovir  alafenamide tablets
  • Brand Name: Symtuza
  • Drug Class: HIV, ART Combos
Last updated on MDtodate: 10/13/2022

SIDE EFFECTS

The following adverse reactions are discussed in other sections of the labeling:

  • Severe acute exacerbations of hepatitis B
  • Hepatotoxicity
  • Severe skin reactions
  • Immune reconstitution syndrome
  • New onset or worsening renal impairment
  • Lactic acidosis/severe hepatomegaly with steatosis

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 practice.

Clinical Trials In Adults

Adverse Reactions In Adults With No Prior Antiretroviral Treatment History

The safety profile of SYMTUZA in HIV-1 infected adults with no prior antiretroviral treatment history is based on Week 48 data from the AMBER trial, a randomized, double-blind, active-controlled trial where a total of 362 subjects received SYMTUZA once daily and 363 subjects received a combination of PREZCOBIX® (fixed-dose combination of darunavir and cobicistat) and fixed-dose combination of emtricitabine and tenofovir disoproxil fumarate (FTC/TDF).

The proportion of subjects who discontinued treatment with SYMTUZA or PREZCOBIX+FTC/TDF due to adverse events, regardless of severity, were 2% and 4% respectively.

An overview of the most frequent (occurring in at least 2% of subjects) adverse reactions irrespective of severity reported in AMBER are presented in Table 1. An overview of the most frequent laboratory abnormalities of at least Grade 2 severity reported in AMBER are presented in Table 2. Changes from baseline in lipid parameters for patients receiving SYMTUZA and those receiving PREZCOBIX + FTC/TDF are presented in Table 3.

Most adverse reactions during treatment with SYMTUZA were grade 1 or 2 in severity. One grade 3 adverse reaction was reported and no grade 4 adverse reactions were reported during treatment with SYMTUZA.

Table 1: Adverse Reactions Reported in ≥2% of HIV-1 Infected Adults With No Prior Antiretroviral Treatment History in AMBER (Week 48 Analysis)

SYMTUZA
(N=362)
PREZCOBIX+FTC/TDF
(N=363)
All Grades At least Grade 2 All Grades At least Grade 2
Diarrhea 9% 2% 11% 2%
Rasha 8% 4% 7% 5%
Nausea 6% 1% 10% 3%
Fatigue 4% 1% 4% 1%
Headache 3% 1% 2% 1%
Abdominal discomfort 2% 4% <1%
Flatulence 2% <1% 1%
Includes pooled reported terms: dermatitis, dermatitis allergic, erythema, photosensitivity reaction, rash, rash generalized, rash macular, rash maculo-papular, rash morbilliform, rash pruritic, toxic skin eruption, urticaria

 

Adverse Reactions In Virologically-Suppressed Adults

The safety profile of SYMTUZA in virologically-suppressed HIV-1 infected adults is based on Week 48 data from 1,141 subjects in the EMERALD trial, a randomized, open-label, active-controlled trial where 763 subjects with a stable antiretroviral regimen consisting of a boosted protease inhibitor (bPI) [either darunavir once daily or atazanavir (both boosted with ritonavir or cobicistat), or lopinavir with ritonavir] combined with FTC/TDF switched to SYMTUZA, and 378 subjects who continued their treatment regimen of a bPI with FTC/TDF. Overall, the safety profile of SYMTUZA in subjects in this study was similar to that in subjects with no prior antiretroviral treatment history. The proportion of subjects who discontinued treatment with SYMTUZA due to adverse events, regardless of severity, was 1%.

Less Frequent Adverse Reactions

The following adverse reactions occurred in less than 2% of adults with no antiretroviral treatment history or virologically suppressed subjects receiving SYMTUZA, or are from studies described in the prescribing information of the individual component PREZISTA (darunavir).

Gastrointestinal Disorders: dyspepsia, pancreatitis (acute), vomiting

Skin and Subcutaneous Tissue Disorders: angioedema, pruritus, Stevens-Johnson syndrome

Metabolism and Nutrition Disorders: anorexia, diabetes mellitus, lipodystrophy

Reproductive System and Breast Disorders: gynecomastia

Musculoskeletal and Connective Tissue Disorders: myalgia, osteonecrosis

Psychiatric Disorders: abnormal dreams

Immune System Disorders: (drug) hypersensitivity, immune reconstitution inflammatory syndrome

Hepatobiliary Disorders: acute hepatitis

Laboratory Abnormalities

Table 2: Laboratory Abnormalities (Grade 2-4) Reported in ≥2% of Adults With No Prior Antiretroviral Treatment History in AMBER (Week 48 Analysis)

Laboratory Parameter
Grade
Limit SYMTUZA
N=362
PREZCOBIX + FTC/TDF
N=363
Creatinine
Grade 2 >1.3 to 1.8 x ULN 4% 14%
Grade 4 ≥3.5x ULN <1% 0
Triglycerides
Grade 2 301-500 mg/dL 7% 4%
Grade 3 501-1,000 mg/dL 1% 1%
Grade 4 >1,000 mg/dL <1% <1%
Total Cholesterol
Grade 2 240-<300 mg/dL 17% 4%
Grade 3 ≥ 300 mg/dL 2% 1%
Low-Density Lipoprotein Cholesterol
Grade 2 160-189 mg/dL 9% 4%
Grade 3 ≥190 mg/dL 5% 1%
Elevated Glucose Levels
Grade 2 126-250 mg/dL 6% 6%
Grade 3 251-500 mg/dL <1% 0

 

ALT and/or AST elevations (Grade 2-4 combined) occurred in 2% of adult subjects receiving SYMTUZA with no antiretroviral treatment history in AMBER (Week 48 Analysis). Results were consistent in subjects receiving PREZCOBIX+FTC/TDF.

Table 3: Lipid Values, Mean Change from Baseline, Reported in Adults With No Prior Antiretroviral Treatment History in AMBER (Week 48 Analysis)

Meana SYMTUZA
N=362
PREZCOBIX + FTC/TDF
N=363
Baseline mg/dL Week 48 Change Baseline mg/dL Week 48 Change
Nb N=304c N=290
Total cholesterol 168 +30 164 +11
HDL cholesterol 45 +6 44 +2
LDL cholesterol 100 +19 98 +5
Triglycerides 117 +34 112 +21
Total cholesterol to HDL ratio 4.1 0.2 4.0 0.1
The change from baseline is the mean of within-subject changes from baseline for subjects with both baseline and Week 48 values, or the last value carried forward prior to initiating lipid-lowering agent post-baseline.
b N corresponds to the number of subjects with paired values and not on a lipid-lowering agent at screening/baseline. Subjects on lipid-lowering agents at screening/baseline were excluded from the analysis (6 out of 362 subjects on SYMTUZA, 8 out of 363 subjects on PREZCOBIX+FTC/TDF). Subjects initiating a lipid-lowering agent post-baseline had their last fasted on-treatment value (prior to starting the agent) carried forward (6 on SYMTUZA, 2 on PREZCOBIX+FTC/TDF).
c One subject did not have a Week 48 result for LDL cholesterol (n=303).

 

The percentage of subjects starting any lipid lowering drug during treatment in the SYMTUZA and PREZCOBIX + FTC/TDF arm were 1.7% (n=6) and 0.6% (n=2), respectively.

Renal Laboratory Tests

In the AMBER trial, which enrolled 725 adults with no prior antiretroviral treatment history, subjects had a median baseline eGFR (estimated glomerular filtration rate) of 119 mL/min (SYMTUZA) and 118 mL/min (PREZCOBIX + FTC/TDF). From baseline to Week 48, mean (SD) serum creatinine increased by 0.05 (0.10) mg/dL in the SYMTUZA group and by 0.09 (0.11) mg/dL in the PREZCOBIX + FTC/TDF group. Median serum creatinine was 0.90 mg/dL (SYMTUZA) and 0.89 mg/dL (PREZCOBIX + FTC/TDF) at baseline and 0.95 mg/dL (SYMTUZA) and 0.97 mg/dL (PREZCOBIX +FTC/TDF) at Week 48. Increases in serum creatinine occurred by Week 2 of treatment and remained stable. Median urine protein-tocreatinine ratio (UPCR) was 47 mg/g (SYMTUZA) and 51 mg/g (PREZCOBIX + FTC/TDF) at baseline and 30 mg/g (SYMTUZA) and 34 mg/g (PREZCOBIX + FTC/TDF) at Week 48.

In the EMERALD trial which had 1,141 virologically-suppressed adults treated with an HIV protease inhibitor and TDF containing regimen with a median baseline eGFR of 104 mL/min (SYMTUZA) and 103 mL/min (bPI+FTC/TDF) who were randomized to continue their treatment regimen or switch to SYMTUZA, at Week 48, mean serum creatinine was similar to baseline for both those continuing baseline treatment and those switching to SYMTUZA. Mean (SD) serum creatinine was 0.98 (0.18) mg/dL (SYMTUZA) and 0.98 (0.19) mg/dL (bPI+FTC/TDF) at baseline and 0.99 (0.18) mg/dL (SYMTUZA) and 0.99 (0.21) mg/dL (bPI+FTC/TDF) at Week 48. Median serum creatinine was 0.97 mg/dL (SYMTUZA) and 0.98 mg/dL (bPI+FTC/TDF) at baseline and 1.0 mg/dL (SYMTUZA) and 0.97 mg/dL (bPI+FTC/TDF) at Week 48. Median UPCR was 62 mg/g (SYMTUZA) and 63 mg/g (bPI+FTC/TDF) at baseline and 37 mg/g (SYMTUZA) and 53 mg/g (bPI+FTC/TDF) at Week 48.

Bone Mineral Density

AMBER

The effects of SYMTUZA compared to PREZCOBIX + FTC/TDF on bone mineral density (BMD) change from baseline to Week 48 were assessed by dual-energy X-ray absorptiometry (DXA). The mean percentage change in BMD from baseline to Week 48 was -0.7% with SYMTUZA compared to -2.4% with PREZCOBIX + FTC/TDF at the lumbar spine and 0.2% compared to -2.7% at the total hip. BMD declines of 5% or greater at the lumbar spine were experienced by 16% of SYMTUZA subjects and 22% of PREZCOBIX + FTC/TDF subjects. BMD declines of 7% or greater at the femoral neck were experienced by 2% of SYMTUZA subjects and 15% of PREZCOBIX + FTC/TDF subjects. The long-term clinical significance of these BMD changes is not known.

EMERALD

In EMERALD, bPI and TDF-treated subjects were randomized to continue their TDF-based regimen or switch to SYMTUZA; changes in BMD from baseline to Week 48 were assessed by DXA. The mean percentage change in BMD from baseline to Week 48 was 1.5% with SYMTUZA compared to -0.6% with bPI + FTC/TDF at the lumbar spine and 1.4% compared to -0.3% at the total hip. BMD declines of 5% or greater at the lumbar spine were experienced by 2% of SYMTUZA subjects and 9% of bPI + FTC/TDF subjects. BMD declines of 7% or greater at the femoral neck were experienced by no SYMTUZA subjects and 2% of bPI + FTC/TDF subjects. The long-term clinical significance of these BMD changes is not known.

Clinical Trials In Pediatric Patients

Adverse Reactions In Pediatric Patients Weighing At Least 40 kg

No clinical trials with SYMTUZA were performed in pediatric patients. However, the safety of the components of SYMTUZA was evaluated in pediatric subjects of 12 to less than 18 years of age through clinical trials GS-US-216-0128 (virologically-suppressed, N=7 with weight ≥40 kg) for darunavir co-administered with cobicistat and other antiretroviral agents, and GS-US-292-0106 (treatment-naive, N=50 with weight ≥35 kg) for a fixed-dose combination regimen containing cobicistat, emtricitabine, and tenofovir alafenamide together with elvitegravir. Safety analyses of the trials in these pediatric subjects did not identify new safety concerns compared to the known safety profile of SYMTUZA in adult subjects.

Postmarketing Experience

The following additional adverse reactions that may occur in patients taking SYMTUZA have been identified during postmarketing experience in patients receiving a darunavir-containing regimen. 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.

Metabolism and Nutrition Disorders: redistribution of body fat

Musculoskeletal and Connective Tissue Disorders: rhabdomyolysis (associated with co-administration with HMG-CoA reductase inhibitors)

Skin and Subcutaneous Tissue Disorders: toxic epidermal necrolysis, acute generalized exanthematous pustulosis, drug rash with eosinophilia and systemic symptoms

Renal and Urinary Disorders: acute renal failure, acute tubular necrosis, proximal renal tubulopathy, and Fanconi syndrome

 

SRC: NLM .