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Diclofenac

Diclofenac
Diclofenac belongs to the pharmacotherapeutic group of non-steroidal anti-inflammatory and antirheumatic drugs. The drug relieves pain, reduces inflammatory edema and swelling of joints, muscles, ligaments:

Brand: Diclofenac

Availability: In Stock
Average Delivery Time: 9 Days
Exp. Date: September 2023
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Product description

Pharmacological action of Diclofenac

Buy Diclofenac in Canada

NSAIDs, a derivative of phenylacetic acid. It has a pronounced anti-inflammatory, analgesic and moderate antipyretic effect. The mechanism of action is associated with inhibition of the activity of COX, the main enzyme of the metabolism of arachidonic acid, which is a precursor of prostaglandins, which play an important role in the pathogenesis of inflammation, pain and fever. The analgesic effect is due to two mechanisms: peripheral (indirectly, through suppression of prostaglandin synthesis) and central (due to inhibition of prostaglandin synthesis in the central and peripheral nervous system).

In vitro, at concentrations equivalent to those achieved in the treatment of patients, does not inhibit the biosynthesis of proteoglycans in cartilage tissue.

In rheumatic diseases, it reduces joint pain at rest and during movement, as well as morning stiffness and swelling of the joints, and helps to increase the range of motion. Reduces post-traumatic and postoperative pain, as well as inflammatory edema.

In case of post-traumatic and postoperative inflammatory events, it quickly relieves pain (arising both at rest and during movement), reduces inflammatory edema and edema of a postoperative wound.

Suppresses platelet aggregation. With prolonged use, it has a desensitizing effect.

Pharmacokinetics

After oral administration, it is absorbed from the gastrointestinal tract. Food intake slows down the rate of absorption, while the degree of absorption does not change. About 50% of the active substance is metabolized during the "first pass" through the liver. With rectal administration, absorption is slower. The time to reach Cmax in plasma after oral administration is 2-4 hours, depending on the dosage form used, after rectal administration - 1 hour, intramuscular administration - 20 minutes. The concentration of the active substance in the plasma is linearly dependent on the size of the applied dose.

Does not cumulate. Plasma protein binding is 99.7% (mainly with albumin). Penetrates into synovial fluid, Cmax is reached 2-4 hours later than in plasma.

It is metabolized to a large extent with the formation of several metabolites, among which two are pharmacologically active, but to a lesser extent than diclofenac.

The systemic clearance of the active substance is approximately 263 ml / min. T1/2 from plasma is 1-2 hours, from synovial fluid - 3-6 hours. Approximately 60% of the dose is excreted in the form of metabolites by the kidneys, less than 1% is excreted in the urine unchanged, the rest is excreted as metabolites in the bile.

Indications of the active substances of the drug Diclofenac

Back pain treatment with Diclofenac

Inflammatory and degenerative diseases of the musculoskeletal system, incl. rheumatoid, juvenile, chronic arthritis; ankylosing spondylitis and other spondyloarthropathies; osteoarthritis; gouty arthritis; bursitis, tendovaginitis; spinal pain syndrome (lumbago, sciatica, ossalgia, neuralgia, myalgia, arthralgia, sciatica); post-traumatic postoperative pain syndrome accompanied by inflammation (for example, in dentistry and orthopedics); algodismenorrhea; inflammatory processes in the small pelvis (including adnexitis); infectious and inflammatory diseases of ENT organs with severe pain syndrome (as part of complex therapy): pharyngitis, tonsillitis, otitis media.

Isolated fever is not an indication for the drug.

The drug is intended for symptomatic therapy, reducing pain and inflammation at the time of use, does not affect the progression of the disease.

Dosage regimen of Diclofenac

Diclofenac tablets packaging

The dose is selected individually, it is recommended to use the drug in the minimum effective dose, if possible with the shortest possible treatment period.

For oral administration and rectal administration

Adults

When taken orally in the form of tablets of the usual duration of action or rectally in the form of suppositories, the recommended initial dose is 100-150 mg / day. In relatively mild cases of the disease, as well as for long-term therapy, 75-100 mg / day is sufficient. The daily dose should be divided into several doses.

When taken in the form of prolonged-release tablets, the recommended initial dose is 100 mg 1 time / day. The same daily dose is used for moderate symptoms, as well as for long-term therapy. In cases where the symptoms of the disease are most pronounced at night or in the morning, it is advisable to take extended-release tablets at night.

To relieve night pain or morning stiffness, in addition to taking the drug during the day, diclofenac is prescribed in the form of rectal suppositories at bedtime; the total daily dose should not exceed 150 mg.

In primary dysmenorrhea, the daily dose is selected individually; usually it is 50-150 mg. The initial dose should be 50-100 mg; if necessary, during several menstrual cycles, it can be increased to 150 mg / day. The drug should be taken when the first symptoms appear. Depending on the dynamics of clinical symptoms, treatment can be continued for several days.

Elderly patients (65 years and older) initial dose adjustment is required.

In debilitated patients, patients with low body weight, it is recommended to adhere to the minimum dose.

The drug should be used with extreme caution in patients with diseases of the cardiovascular system (including uncontrolled arterial hypertension) or a high risk of developing cardiovascular diseases. If long-term therapy is necessary (more than 4 weeks) in such patients, the drug should be used in a daily dose not exceeding 100 mg.

Children aged 1 year and older

The drug is prescribed in a dose of 0.5-2 mg / kg body weight / day (in 2-3 doses, depending on the severity of the disease). For the treatment of rheumatoid arthritis, the daily dose may be increased to a maximum of 3 mg / kg (in divided doses). The maximum daily dose is 150 mg.

The drug in the form of sustained-release tablets should not be used in children and adolescents under the age of 18.

For parenteral use

Adults

Inject deeply into the / m. Single dose - 75 mg. If necessary, re-introduction is possible, but not earlier than after 12 hours. The duration of use is no more than 2 days, if necessary, then they switch to oral or rectal use of diclofenac.

In severe cases (for example, with colic), as an exception, 2 injections of 75 mg can be given, with an interval of several hours (the second injection should be carried out in the opposite gluteal region). Alternatively, intramuscular administration 1 time / day (75 mg) can be combined with diclofenac in other dosage forms (tablets, rectal suppositories), while the total daily dose should not exceed 150 mg.

In migraine attacks, it is recommended to administer diclofenac as soon as possible after the onset of the attack, IM at a dose of 75 mg, followed by the use of suppositories at a dose of up to 100 mg on the same day, if required. The total daily dose should not exceed 175 mg on the first day.

Elderly patients (65 years and older) initial dose adjustment is required. In debilitated patients, patients with low body weight, it is recommended to adhere to the minimum dose.

The drug should be used with extreme caution in patients with diseases of the cardiovascular system (including those with uncontrolled arterial hypertension) or a high risk of developing cardiovascular diseases. If long-term therapy is necessary (more than 4 weeks) in such patients, the drug should be used in a daily dose not exceeding 100 mg.

Children and adolescents under 18 years of age

Diclofenac should not be used intramuscularly in children and adolescents under 18 years of age due to the difficulty of dosing the drug.


Contraindications to use

Hypersensitivity to diclofenac and excipients of the drug used; "aspirin triad" (attacks of bronchial asthma, urticaria and acute rhinitis when taking acetylsalicylic acid or other NSAIDs); erosive and ulcerative lesions of the gastrointestinal tract in the acute phase; proctitis (only for suppositories); pregnancy (for i / m administration); III trimester of pregnancy (for oral and rectal administration); children and adolescents up to 18 years old (for i / m administration and for dosage forms of prolonged action).

With care: suspected gastrointestinal disease; a history of gastrointestinal bleeding and ulcer perforation (especially in elderly patients), Helicobacter pylori infection, ulcerative colitis, Crohn's disease, dysfunction; mild to moderate liver dysfunction, hepatic porphyria (diclofenac can provoke porphyria attacks); in patients with bronchial asthma, seasonal allergic rhinitis, edema of the nasal mucosa (including with polyps in the nasal cavity), COPD, chronic respiratory tract infections (especially associated with allergic rhinitis-like symptoms); cardiovascular diseases (including coronary artery disease, cerebrovascular disease, compensated heart failure, peripheral vascular disease); impaired renal function, including chronic renal failure (CC 30-60 ml / min); dyslipidemia / hyperlipilemia; diabetes; arterial hypertension; a significant decrease in the BCC of any etiology (for example, in the periods before and after massive surgical interventions); violation of the hemostatic system; the risk of thrombosis (including myocardial infarction and stroke); elderly patients, especially those who are weak or have low body weight (diclofenac should be used in the minimum effective dose); in patients receiving drugs that increase the risk of gastrointestinal bleeding, including systemic corticosteroids (including prednisone), anticoagulants (including warfarin), antiplatelet agents (including clopidogrel, acetylsalicylic acid), selective inhibitors serotonin reuptake (including citalopram, fluoxetine, paroxetine, sertraline); simultaneous treatment with diuretics or other drugs that can impair renal function; in the treatment of smoking patients or patients with alcohol abuse; when administered intramuscularly to patients with bronchial asthma due to the risk of exacerbation of the disease (since sodium bisulfite, which is contained in some dosage forms for injection, can cause severe hypersensitivity reactions).

Application during pregnancy and lactation

There is not enough data on the safety of diclofenac use in pregnant women. Therefore, the appointment in the I and II trimesters of pregnancy is possible only in cases where the expected benefit to the mother outweighs the potential risk to the fetus. Diclofenac (like other inhibitors of prostaglandin synthesis) is contraindicated in the third trimester of pregnancy (suppression of uterine contractility and premature closure of the ductus arteriosus in the fetus is possible).

Despite the fact that diclofenac is excreted in breast milk in small quantities, use during lactation (breastfeeding) is not recommended. If necessary, use during lactation, breastfeeding should be discontinued.

Since diclofenac (like other NSAIDs) can have a negative effect on fertility, it is not recommended for women planning a pregnancy.

For patients undergoing examination and treatment for infertility, the drug should be canceled.

Application for violations of liver function

Use with extreme caution with a history of liver disease.

Application for impaired renal function

Use with extreme caution in case of a history of kidney disease.

Use in children

Not recommended for use in children under 6 years of age.

Use in elderly patients

Use with extreme caution in elderly patients.

Special instructions

Use with extreme caution in diseases of the liver, kidneys, gastrointestinal tract in history, dyspeptic symptoms, bronchial asthma, arterial hypertension, heart failure, immediately after serious surgical interventions, as well as in elderly patients.

If there is a history of allergic reactions to NSAIDs and sulfites, diclofenac is used only in urgent cases. In the course of treatment, systematic monitoring of liver and kidney function, and peripheral blood patterns is necessary.

Rectal administration is not recommended in patients with a history of anorectal disease or anorectal bleeding. Externally should be used only on intact skin.

Avoid getting diclofenac in the eyes (with the exception of eye drops) or mucous membranes. Patients using contact lenses should apply eye drops no earlier than 5 minutes after removing the lenses.

Not recommended for use in children under 6 years of age.

During the period of treatment with dosage forms for systemic use, alcohol is not recommended.

Influence on the ability to drive vehicles and mechanisms

During the treatment period, it is possible to reduce the speed of psychomotor reactions. If the clarity of vision deteriorates after using the eye drops, do not drive and engage in other potentially hazardous activities.

Drug Interactions

Potent CYP2C9 inhibitors - when diclofenac and potent CYP2C9 inhibitors (such as voriconazole) are coadministered, it is possible to increase the concentration of diclofenac in the blood serum and increase the systemic effect caused by inhibition of diclofenac metabolism.

Lithium, digoxin -is itpossible to increase the concentration of lithium and digoxin in the plasma curve. Monitoring of the concentration of lithium, digoxin in the blood serum is recommended.

Diuretics and antihypertensive drugs - when used simultaneously with diuretics and antihypertensive drugs (for example, beta-blockers, ACE inhibitors), diclofenac can reduce their hypotensive effect.

Cyclosporine - The effect of diclofenac on the activity of prostate glandins in the kidneys may increase the nephrotoxicity of cyclosporine.

Drugs that can cause hyperkalemia - the combined use of diclofenac with potassium-sparing diuretics, cyclosporine, tacrolimus and trimethoprim can lead to an increase in the level of potassium in the blood plasma (in the case of such a combination, this indicator should be frequently monitored).

Antibacterial agents quinolone derivatives - there are separate reports of the development of seizures in patients who received both quinolone derivatives and diclofecac.

NSAIDs and GCS - with the simultaneous systemic use of diclofenac and other systemic NSAIDs or GCS can increase the incidence of adverse events (in particular, from the gastrointestinal tract).

Anticoagulants and antiplatelet agents - an increase in the risk of bleeding cannot be ruled out with the simultaneous use of diclofenac and with drugs of these groups.

Selective serotonin reuptake inhibitors - may increase the risk of gastrointestinal bleeding.

Hypoglycemic drugs - cases of both hypoglycemia and hyperglycemia cannot be excluded, which necessitated a change in the dose of hypoglycemic drugs against the background of diclofenac use.

Methotrexate - when using diclofenac within 24 hours before or within 24 hours after taking methotrexate, it is possible to increase the concentration of methotrexate in the blood and increase its toxic effect.

Phenytoin -is itpossible to enhance the effect of phenytoin.


Side effect

Determination of the frequency of adverse reactions: very often (≥1 / 10), often (≥1 / 100, <1/10) rarely (≥1 / 1000, <1/100), rarely (≥1 / 10,000, < 1/1000), very rare (<1/10 000).

From the digestive system: often - abdominal pain, nausea, vomiting, diarrhea, dyspepsia, flatulence, loss of appetite, anorexia, increased activity of aminotransferases in blood serum; rarely - gastritis, gastrointestinal bleeding, vomiting of blood, melena, diarrhea mixed with blood, stomach and intestinal ulcers (with or without bleeding or perforation), hepatitis, jaundice, liver dysfunction; very rarely - stomatitis, glossitis, damage to the esophagus, the occurrence of diaphragmatic strictures in the intestine, colitis (nonspecific hemorrhagic colitis, exacerbation of ulcerative colitis or Crohn's disease), constipation, pancreatitis, fulminant hepatitis, liver necrosis, liver failure.

From the nervous system: often - headache, dizziness; rarely - drowsiness; very rarely - sensitivity disorders, including paresthesias, memory disorders, tremors, convulsions, anxiety, acute cerebrovascular accidents, aseptic meningitis; very rarely - disorientation, depression, insomnia, nightmares, irritability, mental disorders.

From the senses: often - vertigo; very rarely - visual impairment (blurred vision), diplopia, hearing impairment, tinnitus, dysgeusia.

Dermatological reactions: often - skin rash; rarely - urticaria; very rarely - bullous rashes, eczema, erythema, erythema multiforme, Stevens-Johnson syndrome, Lyell's syndrome (toxic epidermal necrolysis), exfoliative dermatitis, pruritus, hair loss, photosensitivity reactions; purple, Shenlein-Henoch purple.

From the genitourinary system: very rarely - acute renal failure, hematuria, proteinuria, tubulointerstitial nephritis, nephrotic syndrome, papillary necrosis.

Co sides of the hematopoietic system: very rarely - thrombocytopenia, leukopenia, hemolytic anemia, aplastic anemia, agranulocytosis.

Allergic reactions: rarely - hypersensitivity, anaphylactic / anaphylactoid reactions, including a decrease in blood pressure and shock; very rarely - angioedema (including facial edema).

From the side of the cardiovascular system: very rarely - a feeling of palpitations, chest pain, increased blood pressure, vasculitis, heart failure, myocardial infarction. There is evidence of a slight increase in the risk of developing cardiovascular thrombotic complications (for example, myocardial infarction), especially with long-term use of diclofenac in high doses (daily dose more than 150 mg).

From the respiratory system: rarely - asthma (including shortness of breath); very rarely - pneumonitis.

General reactions: rarely - edema.