Telmisartan
Telmisartan may increase the antihypertensive effect of other antihypertensive agents. Other types of interactions that have clinical relevance have not been identified.
Combined use with digoxin, warfarin, hydrochlorothiazide, glibenclamide, ibuprofen, paracetamol, simvastatin and amlodipine does not lead to clinically significant interaction.
Double blockade of the renin-angiotensin-aldosterone system (RAAS)
The concomitant use of telmisartan with aliskiren is contraindicated in patients with diabetes mellitus or renal insufficiency (GFR less than 60 mL / min / 1.73 m2 body surface area) and is not recommended for other patients. The simultaneous use of telmisartan and ACE inhibitors is contraindicated in patients with diabetic nephropathy.
Clinical studies have shown that the double blockade of RAAS due to the combined use of ACE inhibitors, APA II or aliskiren is associated with an increased incidence of adverse events such as hypotension, hyperkalemia and renal dysfunction (including acute renal failure) compared with the use of only one drug , operating on the RAAS.
The risk of hyperkalemia can increase when combined with other drugs capable of causing hyperkalemia (kalisodergaszczye supplements and salt substitutes containing potassium, potassium-sparing diuretics (spironolactone, eplerenone, triamterene or amiloride), non-steroidal anti-inflammatory drugs (NSAIDs, including selective inhibitors of cyclooxygenase-2 (COX)), heparin, immunosuppressants (ciclosporin, tacrolimus, trimethoprim)). If necessary, against the background of documented hypokalemia, joint use of drugs should be carried out with caution and regularly monitor the potassium content in the blood plasma.
Digoxin
With the joint administration of telmisartan with digoxin, an increase in the mean Cmof digoxin in the blood plasma by 49% and a minimum concentration of 20%. At the beginning of treatment, when choosing a dose and stopping telmisartan treatment, the concentration of digoxin in the blood plasma should be carefully monitored for its maintenance within the therapeutic range.
Potassium-sparing diuretics or potassium-containing food additives
Angiotensin II receptor antagonists, such as telmisartan, reduce the diuretic-induced loss of potassium. Potassium-sparing diuretics, for example, spironolactone, eplerenone, triamterene or amiloride, potassium-containing dietary supplements or salt substitutes can lead to a significant increase in potassium levels in the blood plasma. If concomitant use is indicated, since there is documented hypokalemia, they should be used with caution and against the background of regular monitoring of potassium in the blood plasma.
Lithium preparations
When co-administration of lithium preparations with ACE inhibitors and APA II, including telmisartan, there was a reversible increase in the concentration of lithium in the blood plasma and its toxic effect.If it is necessary to use this combination of drugs, it is recommended to carefully monitor the concentration of lithium in the blood plasma.
Non-steroidal anti-inflammatory drugs (NSAIDs)
NSAIDs (including acetylsalicylic acid in doses used for anti-inflammatory treatment, COX-2 inhibitors and nonselective NSAIDs) can reduce the antihypertensive effect of APA II. In some patients with impaired renal function (eg, patients with dehydration, elderly patients with impaired renal function), joint application of APA II and drugs depressing cyclooxygenase-2 can lead to further deterioration of renal function, including the development of acute renal failure, which is usually reversible. Therefore, joint use of drugs should be done with caution, especially elderly patients. Proper fluid intake should also be ensured, in addition, at the beginning of the joint application and periodically the kidney function should be monitored periodically thereafter.
Diuretics (thiazide or loop diuretics)
Prior treatment with high doses of diuretics, such as furosemide (loop diuretic) and hydrochlorothiazide (thiazide diuretic), can lead to hypovolemia and the risk of developing arterial hypotension at the beginning of telmisartan treatment.
Other antihypertensive agents
The effect of telmisartan may be enhanced by the joint use of other antihypertensive drugs. Based on the pharmacological properties of baclofen and amifostine, it can be assumed that they will enhance the therapeutic effect of all antihypertensive agents, including telmisartan. In addition, orthostatic hypotension may increase with the use of alcohol, barbiturates, drugs or antidepressants.
Corticosteroids (for systemic use)
Corticosteroids weaken the action of telmisartan.
Hydrochlorothiazide
When used simultaneously with:
- ethanol, barbiturates or narcotic analgesics: risk of orthostatic hypotension;
- hypoglycemic agents for oral administration and insulin: it may be necessary to correct the dose of hypoglycemic agents for ingestion and insulin;
- Metformin: risk of lactic acidosis;
- colstiramine and colestipolum: in the presence of anionic exchange resins, hydrochlorothiazide absorption is impaired;
- cardiac glycosides: the risk of hypokalemia or hypomagnesemia caused by thiazide diuretics, the development of arrhythmias caused by the intake of cardiac glycosides;
- Pressor amines (for example, norepinephrine): possible weakening of the effect of pressor amines;
- Nondepolarizing muscle relaxants (for example, tubocurarine chloride): hydrochlorothiazide can enhance the effect of nondepolarizing muscle relaxants;
- antidotal agents: the concentration of uric acid in the blood serum may increase and, therefore, changes in the dose of uricosuric agents may be required. The use of thiazide diuretics increases the frequency of development of hypersensitivity reactions to allopurinol;
- preparations of calcium and vitamin D: Thiazide diuretics can increase the calcium content in the blood serum due to the decrease in its excretion by the kidneys. If you want to use calcium preparations, you should regularly monitor the calcium content in the blood and, if necessary, change the dose of calcium preparations;
- beta-adrenoblockers and diazoxide: Thiazide diuretics can increase hyperglycemia caused by beta-blockers and diazoxide;
- m holinoblokatorami (for example, atropine, biperidin): a decrease in the motility of the gastrointestinal tract, an increase in the bioavailability of thiazide diuretics;
- amantadine: the clearance of amantadine can be reduced by hydrochlorothiazide, which leads to an increase in the concentration of amantadine in blood plasma and possible toxicity;
- with cytotoxic agents (eg, cyclophosphamide, methotrexate): decrease in renal excretion of cytotoxic agents and enhancement of their myelosuppressive action;
- NSAIDs: joint use with thiazide diuretics can lead to a decrease in diuretic and antihypertensive effect;
- drugs that lead to the excretion of potassium and hypokalemia (for example, diuretics, potassium, laxatives, glucocorticosteroids, calcitonin, ACTH (adrenocorticotropic hormone), glycyrrhizic acid (found in licorice root), amphotericin B; carbenoxolone; benzylpenicillin; derivatives of acetylsalicylic acid): increased hypokalemic effect.Hypokalemia caused by hydrochlorothiazide is compensated by the potassium-sparing effect of telmisartan;
- theophylline: increased risk of hypokalemia;
- amiodarone: simultaneous use with thiazide diuretics can lead to an increased risk of arrhythmias associated with hypokalemia;
- potassium-sparing diuretics, potassium preparations, other agents that can increase the content of serum in the blood serum (eg, heparin) or the replacement of sodium in table salt with potassium salts can lead to hyperkalemia.
Periodic monitoring of the potassium content in the blood plasma is recommended in cases when the preparation Telprus Plus is prescribed together with drugs that can cause hypokalemia, as well as with drugs that can increase the potassium content in the blood serum.