The most common side effects when applying the Method® are suppression of the hematopoiesis system and disorders of the gastrointestinal tract.
To indicate the frequency of effects, the following gradations are applied: very often (≥ 1/10), often (≥ 1/100, <1/10), infrequently (≥ 1/1000, <1/100). rarely (≥ 1/10000, <1/1000). very rarely (<1/10000), the frequency is unknown (can not be estimated based on available data).
Disorders from the gastrointestinal tract
Very often: stomatitis, dyspepsia, nausea, loss of appetite.
Often: oral ulcers, diarrhea.
Infrequently: pharyngitis, enteritis, vomiting.
Rarely: erosive and ulcerative lesions of the gastrointestinal tract.
Very rarely: vomiting with an admixture of blood, bleeding from the gastrointestinal tract (including melena, hematemesis), toxic megacolon.
Disturbances from the liver and bile ducts
Very often: increased activity of transaminases.
Infrequently: cirrhosis, fibrosis and fatty degeneration of the liver, a decrease in the concentration of serum albumin.
Rarely: acute hepatitis.
Very rarely: hepatic insufficiency.
Disturbances from the skin and subcutaneous tissues
Often: exanthema, erythema, itchy skin.
Infrequently: photosensitization, hair loss, increased rheumatic nodes, vasculitis, Herpes zoster, herpetiform rashes on the skin, urticaria.
Rarely: increased pigmentation, acne, ecchymosis.
Very rarely: Stevens-Johnson syndrome, toxic epidermal necrolysis (Lyell's syndrome), changes in the pigmentation of the nails, acute paronychia, furunculosis, telangiectasia.
Disorders from the metabolism and nutrition
Infrequently: the progression of diabetes.
Disorders from the cardiovascular system
Rarely, pericarditis, pericardial effusion, pericardial tamponade, lowering of arterial pressure, thromboembolic complications (including arterial thrombosis, cerebral thrombosis, deep vein thrombosis, retinal vein thrombosis, thrombophlebitis, pulmonary embolism).
Disturbances from the nervous system
Often: headache, fatigue, snotty.
Infrequently: dizziness, confusion, depression.
Very rarely: pain, muscle weakness or paresthesia of the extremities. a violation of taste sensations (metallic taste), visual impairment, convulsions, meningism, paralysis.
Frequency unknown: leukoencephalopathy.
From the side of the organ of vision
Rarely: visual impairment, conjunctivitis.
Very rarely: retinopathy.
General disorders and disorders at the site of administration
Rarely: allergic reactions up to anaphylactic shock, allergic vasculitis, fever, development of infections, sepsis, deterioration of wound healing, hypogammaglobulinemia.
Very rarely: reactions at the injection site: damage to the skin and surrounding tissue (sterile abscess, lipodystrophy).
Disturbances from the respiratory system, chest and mediastinal organs
Often: pneumonia, interstitial alveolitis / pneumonitis, often in combination with eosionophilia. Symptoms of a potentially serious interstitial pneumonitis: dry, unproductive cough, shortness of breath and fever.
Rarely: pulmonary fibrosis, pneumocystis pneumonia, dyspnea and bronchial asthma, pleural effusion.
On the part of the hematopoiesis system
Often: leukopenia, anemia, thrombocytopenia.
Infrequent: pancytopenia.
Very rarely: agranulocytosis, severe oppression of bone marrow function.
From the genitourinary and urinary systems
Infrequent: inflammation and ulceration of the bladder and / or vagina, impaired urination, impaired renal function.
Rarely: renal failure, oliguria, anuria, electrolyte imbalance.
Very rarely: vaginal discharge, loss of libido, impotence, gynecomastia, oligospermia, menstrual irregularities.
Disturbances from the musculoskeletal system and connective tissue
Infrequently: arthralgia, myalgia, osteoporosis.
Neoplasms benign, malignant and unspecified nature (including cysts and polyps)
Very rarely: single cases of lymphoma have been reported, which in some cases have regressed after discontinuation of methotrexate therapy. In a recent study, it has not been established that methotrexate therapy increases the risk of developing lymphomas.
The frequency and severity of side effects depend on the dose and frequency of methotrexate. Since severe side effects can occur even with the use of low doses of the drug, it is necessary to conduct regular medical examination of patients at short intervals.
With intramuscular introduction of methotrexate, local reactions can occur: a burning sensation at the injection site, the formation of a sterile abscess, the destruction of fatty tissue. When administered subcutaneously methotrexate well tolerated: only moderate local skin reactions were observed, the severity of which decreased during the therapy.