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Mecasermin Side Effects

Medically reviewed by Last updated on Dec 13, 2023.

Applies to mecasermin: subcutaneous solution.

Serious side effects of Mecasermin

Along with its needed effects, mecasermin may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur while taking mecasermin:

More common

Incidence not known

Get emergency help immediately if any of the following symptoms of overdose occur while taking mecasermin:

Symptoms of overdose

Other side effects of Mecasermin

Some side effects of mecasermin may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.

Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common

For Healthcare Professionals

Applies to mecasermin: subcutaneous solution.


The most common adverse events were hypoglycemia, injection site hypertrophy, snoring, hypoacusis, headache, and tonsillar hypertrophy.[Ref]


Very common (10% or more): Hypoglycemia (47%)

Common (1% to 10%): Hypoglycemic seizure, hyperglycemia, hyperlipidemia, obesity, increased weight[Ref]


Very common (10% or more): Injection site hypertrophy (32%)

Common (1% to 10%): Injection site pain, injection site bruising, injection site fibrosis, injection site reaction, injection site swelling, injection site induration, injection site pigmentation changes

Postmarketing reports: Pruritus, urticaria, injection site reactions (e.g. erythema, pain, hematoma, hemorrhage, induration, rash, swelling)[Ref]


Very common (10% or more): Hypoacusis (20%), febrile infection, otitis media, serous otitis media, chronic otitis media serous, otitis externa, ear infection

Common (1% to 10%): Fluid in middle ear, ear pain, abnormal tympanometry, ear tube insertion, otorrhea, ear disorder, middle ear disorder, tympanic membrane disorder, ear congestion, Mucosal membrane hyperplasia, hypertrophy, mucosal edema, asthenia, chest discomfort, abnormal tympanometry, adenotonsillectomy, adenoidectomy, ear tube insertion

Frequency not reported: Elevations in cholesterol, elevations in triglycerides[Ref]


Very common (10% or more): Snoring (22%), tonsillar hypertrophy (16%), upper respiratory tract infection, pharyngitis, tonsillitis

Common (1% to 10%): Tonsillectomy/adenoidectomy, obstructive sleep apnea, adenoidal hypertrophy, nasal turbinate hypertrophy, dyspnea, nasal mucosal disorder, obstructive airway disorder, abnormal respiration, nasal congestion, mouth breathing[Ref]

Nervous system

Very common (10% or more): Headache (18%)

Common (1% to 10%): Intracranial hypertension, dizziness, convulsions, febrile convulsion, benign intracranial hypertension, loss of consciousness, sleep apnea syndrome, dizziness, tremor, restless leg syndrome, lethargy[Ref]


Very common (10% or more): Anti-IGF-1 antibodies (up to 61%), thymus hypertrophy[Ref]


Common (1% to 10%): Cardiac murmur, cardiomegaly, ventricular hypertrophy, atrial hypertrophy, tachycardia, tachycardia paroxysmal, mitral valve incompetence, tricuspid valve incompetence, abnormal echocardiogram

Frequency not reported: Cardiomegaly/valvulopathy[Ref]


Tonsillar hypertrophy appears to occur more frequently in the first 1 to 2 years of therapy with lesser tonsillar growth in subsequent years.[Ref]

Very common (10% or more): Oral candidiasis

Common (1% to 10%): Vomiting, retching, abdominal pain, upper abdominal pain, abdominal distension, dysphagia[Ref]


Common (1% to 10%): Lipohypertrophy, bruising, skin hypertrophy, acrochordons, abnormal hair texture, pigmented nevus

Frequency not reported: Thickening of the soft tissues of the face

Postmarketing reports: Alopecia, hair texture abnormal[Ref]


Common (1% to 10%): Increased alanine aminotransferase, increased aspartate aminotransferase

Frequency not reported: Elevated AST, elevated LDH, elevated ALT[Ref]


Common (1% to 10%): Local and/or systemic hypersensitivity

Postmarketing reports: Anaphylaxis, local allergic reactions, generalized urticaria, angioedema, dyspnea[Ref]


Common (1% to 10%): Lymphadenopathy[Ref]


Common (1% to 10%): Arthralgia, pain in extremity, myalgia, scoliosis, spinal deformity, soft tissue disorder, muscle cramp, flank pain, musculoskeletal stiffness, congenital jaw malformation

Postmarketing reports: Osteonecrosis/avascular necrosis (occasionally associated with slipped capital femoral epiphysis)[Ref]


Common (1% to 10%): Nephrolithiasis, hydronephrosis, renal colic

Frequency not reported: Renal and splenic length increased rapidly[Ref]


Common (1% to 10%): Papilledema, reduced visual acuity, myopia[Ref]


Common (1% to 10%): Gynecomastia, ovarian cyst[Ref]


Common (1% to 10%): Depression, sleep terror, nervousness, abnormal behavior, disorientation[Ref]


1. Product Information. Increlex (mecasermin). Tercica Inc. 2005.

2. Cerner Multum, Inc. UK Summary of Product Characteristics.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.