Children and teens
Headache, abdominal pain6 and decreased appetite are side effects most commonly associated with taking atomoxetine (19%, 18%, and 16%, respectively) in placebo-controlled studies in children, but they usually do not require drug withdrawal (cases of drug withdrawal according to the following indications 0.1% for headache, 0.2% for abdominal pain and 0.0% for loss of appetite). Pain in the abdomen and a decrease in appetite usually are temporary.
In clinical studies of ADHD in children and adolescents at the beginning of therapy, there was a lag in the averagesrates of weight gain and growth from the age norm among those receiving atomoxetine in connection with a reduced appetite. Later, after a long period of time, the body weight and growth parameters in these patients returned to the average age standard, determined taking into account the anthropometric data prior to initiation of treatment with atomoxetine.
Nausea, vomiting and drowsiness1 may appear in approximately 10% and 11% of patients, respectively, especially during the first month of treatment. However, these episodes were usually of mild to moderate severity, were of a temporary nature, and were not the reason for the cancellation of treatment in a significant number of cases (cases of cancellation of the drug are <0.5%).
In placebo-controlled studies in children and adults receiving atomoxetine, there was an increase in heart rate, an increase in systolic and diastolic pressure compared with placebo.
In patients who received atomoxetine, orthostatic hypotension (0.2%) and fainting (0.8%) were noted due to its effect on sympathetic tone. Atomoxetine should be used with caution in any condition that may lead to a decrease in blood pressure.
Below are the side effects and abnormalities in laboratory indicators noted in clinical studies in children and adolescents.
Disorders from the metabolism and nutrition
Very often (> 10%): decreased appetite
Often (1-10%): anorexia (loss of appetite)
Disturbances from the nervous system
Very often (> 10%): drowsiness1, headache
Often (1-10%): dizziness
Infrequently (0.1-1%): fainting2, tremor
Disorders of the psyche
Often (1-10%): mood swings, insomnia3, depression4
Infrequently (0.1-1%): suicidal thoughts and behavior, aggressive behavior, hostility, emotional instability
Disturbances on the part of the organ of sight
Often (1-10%): mydriasis
Infrequently (0.1-1%): conjunctivitis
Violations from the heart and blood vessels
Very often (> 10%): increased blood pressure5, an increase in heart rate5
Infrequent (0.1-1%): palpitations, sinus tachycardia
Disorders from the gastrointestinal tract
Very often (> 10%): abdominal pain6, nausea, vomiting
Often (1-10%): constipation, indigestion
Disturbances from the skin and subcutaneous tissues
Often (1-10%): rash, itching
General disorders
Often (1-10%): fatigue, weight loss, irritability
Infrequently (0.1-1%): asthenia
1 Includes sedation.
2 Includes vasovagal syncope
3 Includes the difficulties of falling asleep, restless sleep and early awakening.
4 Includes major depressive disorder, depressive symptoms, depressed mood and dysphoria.
5 The data are based on measurements of heart rate and blood pressure.
6 Includes the phenomena of discomfort in the abdomen, pain and discomfort in the epigastric abdomen, discomfort in the stomach.
The following side effects were observed in at least 2% of children and adolescents with low activity of the CYP2D6 isoenzyme statistically significantly more often than in patients with high activity of the isoenzyme CYP2D6: weight loss (7.3% and 4.4% respectively), constipation (6.8% and 4.3% respectively), insomnia (11% and 6.1% respectively), depression (6.5% and 4.1% respectively), tremor (4.5% and 0.9% (2.5% and 0.7%, respectively), conjunctivitis (2.5% and 1.2%, respectively), early morning awakening (2, 3% and 0.8% respectively GOVERNMENTAL), mydriasis (2.0% and 0.6%, respectively), sedation (3.9% and 2.1% respectively).
Adults
In clinical studies in adults, the most frequent adverse events during the administration of atomoxetine were from the gastrointestinal tract, the nervous system and the psyche.The most common side effects (> 5%): decreased appetite (14.9%), insomnia (11.3%), headache (16.3%), dry mouth (18.4%) and nausea (26 , 7%). In most cases, all of the listed side effects were mild or moderate. Most often as severe, there were side effects: nausea, insomnia, fatigue, headache.
Complaints about a delay in urination and a difficult onset of urination may potentially be associated with taking atomoxetine.
Below are the side effects and abnormalities in laboratory indicators noted in clinical studies in adults.
Disorders from the metabolism and nutrition
Very often (> 10%>): decreased appetite
Disturbances from the nervous system
Very often (> 10%): headache
Often (1-10%): dizziness, change in taste, paresthesia, drowsiness4, tremor
Disorders of the psyche
Very often (> 10%>): insomnia1
Often (1-10%): agitation, decreased libido, sleep disturbance1
Infrequently (0,1-1,0%): violation of orgasm, anxiety, suicidal thoughts and behavior, aggressive behavior, hostility, emotional instability
Disturbances on the part of the organ of sight
Infrequently (0.1-1.0%): blurred vision
Violations from the heart and blood vessels
Very often (> 10%): increased blood pressure2, an increase in heart rate2
Often (1-10%): palpitations, tachycardia, "hot flashes" (blood), redness of the skin
Infrequent (0.1-1.0%): sensation of cold in the lower limbs
Disorders from the gastrointestinal tract
Very often (> 10%): dry mouth, nausea
Often (1-10%): abdominal pain3, constipation, indigestion, flatulence, vomiting
Disturbances from the skin and subcutaneous tissues
Often (1-10%): rash, hyperhidrosis
Infrequently: (0,1-1,0%): itching, urticaria
Musculoskeletal system disorders
Infrequently (0.1-1.0%): muscle spasms
Disorders from the kidneys and urinary tract
Often (1-10%): dysuria, urinary retention, difficulty in starting urination5, frequent urination
Infrequently: (0,1-1,0%): a painful urge to urinate
Violations of the genitals and mammary gland
Often (1-10%): dysmenorrhea6, ejaculation disorder7, erectile disfunction7, prostatitis7, pain in the testicles7
Infrequently (0.1-1%): lack of ejaculation, violation of the menstrual cycle6
General disorders
Often (1-10%): fatigue, chills, weight loss, asthenia, anxiety, irritability, thirst
Infrequently (0.1-1%): sensation of cold
1 Includes the difficulties of falling asleep, restless sleep and early awakening.
2 The data are based on measurements of heart rate and blood pressure.
3 Includes the phenomena of discomfort in the abdomen, pain and discomfort in the epigastric abdomen, discomfort in the stomach.
4 Includes sedative effect
5 Includes jet reduction
6 The frequency is based on the data of female patients
7 The frequency is based on the data of male patients
The following side effects were observed in at least 2% of adult patients with a low activity of the isoenzyme CYP2D6 statistically significantly more likely than in patients with high isozyme activity CYP2D6: blurred vision (3.9% and 1.3%, respectively), dry mouth (34.5% and 17.4%, respectively), constipation (11.3% and 6.7%, respectively), a sense of anxiety (4.9% and 1.9% respectively), a decrease in appetite (23.2% and 14.7%, respectively), tremor (5.4% and 1.2%, respectively), insomnia (19.2% and 11.3%, respectively), sleep disorders (6.9% and 3.4% respectively), restless sleep (5.4% and 2.7% respectively), early awakening (3.0% and 0.9%, respectively), urinary retention (5.9% and 1.2%, respectively), erectile dysfunction (20.9% and 8.9%, respectively),violation of ejaculation (6.1% and 2.2%, respectively), increased sweating (14.8% and 6.8%, respectively), cold extremities (3.0% and 0.5%, respectively).
Spontaneous (post-marketing) messages
Violations from the heart and blood vessels
Infrequently (0.1-1%): prolongation of the QT interval
Rarely (> 0.01% and <0.1%): increase blood pressure
Very rarely (<0.01%): peripheral vascular reactions and / or Raynaud's syndrome and risk of exacerbation of Raynaud's syndrome
Disorders from the liver and bile ducts
Infrequently (0.1-1%): increase concentration of bilirubin in children and teenagers
Rarely (> 0.01% and <0.1%): a violation of the liver function, jaundice, hepatitis, liver damage, acute liver failure; increasing the concentration of bilirubin in adults.
Disorders from the kidneys and urinary tract
Very rarely (<0.01%): painful or prolonged erections, pain in the genital area of men, difficulty urinating in children and adolescents, delayed urination in children and adolescents
Disturbances from the nervous system
Infrequently (0.1-1%): migraine, convulsive seizures in children and adolescents
Very rarely (<0.01%): syncope, paresthesia in children and adolescents, hypoesthesia, tics Disorders of the psyche
Rarely (> 0.01% and <0.1%): depression and decreased mood, anxiety
Very rarely (<0.01%) perceptual disturbances, including hallucinations
Disturbances from the skin and subcutaneous tissues
Infrequently (0.1-1%): allergic reactions
Very rarely (<0.01%): hyperhidrosis
General disorders
Very rarely (<0.01%): lethargy