Pharmacy No. 84. Delivery of medicines to your home and office.

Medicines

my basket

Apteka84.kz is an online pharmacy that offers its customers medicines, medicinal and decorative cosmetics, dietary supplements, vitamins, baby food, intimate products for adults, medical equipment and thousands of other medical and cosmetic products at low prices. All data presented on the Apteka84.kz website is for informational purposes only and is not a substitute for professional medical care. Apteka84.kz strongly recommends that you carefully read the instructions for use contained in each package of medicines and other products. If you currently have any symptoms of the disease, you should seek help from a doctor. You should always tell your doctor or pharmacist about all the medicines you take. If you feel you need further help, please consult your local pharmacist or contact our GP online or by telephone.

Fluconazole

Single or multiple doses of fluconazole at a dose of 50 mg do not affect the metabolism of phenazone (Antipyrine) when taken simultaneously.

Concomitant use of fluconazole with the following drugs is contraindicated:

Cisapride

: with the simultaneous use of fluconazole and cisapride, adverse reactions from the heart are possible, incl. ventricular tachysystolic arrhythmia of the “pirouette” type (torsade de pointes). The use of fluconazole at a dose of 200 mg once a day and cisapride at a dose of 20 mg 4 times a day leads to a marked increase in plasma concentrations of cisapride and an increase in the QT interval on the ECG. Concomitant use of cisapride and fluconazole is contraindicated.

Terfenadine

: When azole antifungals are used concomitantly with terfenadine, serious arrhythmias may occur as a result of prolongation of the QT interval. When taking fluconazole at a dose of 200 mg/day, an increase in the QT interval has not been established; however, the use of fluconazole at doses of 400 mg/day and above causes a significant increase in the concentration of terfenadine in the blood plasma. Concomitant use of fluconazole in doses of 400 mg/day or more with terfenadine is contraindicated (see section “Contraindications”). Treatment with fluconazole in doses less than 400 mg/day in combination with terfenadine should be carried out under close monitoring.

Astemizole

: simultaneous use of fluconazole with astemizole or other drugs whose metabolism is carried out by the cytochrome P450 system may be accompanied by an increase in serum concentrations of these drugs. Elevated concentrations of astemizole in blood plasma can lead to prolongation of the QT interval and, in some cases, to the development of ventricular tachysystolic arrhythmia of the “pirouette” type (torsade de pointes). The simultaneous use of astemizole and fluconazole is contraindicated.

Pimozide

: Although appropriate
in vitro
or
in vivo
, the simultaneous use of fluconazole and pimozide may lead to inhibition of the metabolism of pimozide. In turn, an increase in plasma concentrations of pimozide can lead to a prolongation of the QT interval and, in some cases, the development of ventricular tachysystolic arrhythmia of the “pirouette” type (torsade de pointes). The simultaneous use of pimozide and fluconazole is contraindicated.

Quinidine

: Although adequate
in vitro
or
in vivo
, concomitant use of fluconazole and quinidine may also lead to inhibition of quinidine metabolism. The use of quinidine is associated with prolongation of the QT interval and, in some cases, with the development of ventricular tachysystolic arrhythmia of the “torsade de pointes” type. The simultaneous use of quinidine and fluconazole is contraindicated.

Erythromycin

: Concomitant use of fluconazole and erythromycin potentially leads to an increased risk of cardiotoxicity (QT prolongation, torsade de pointes) and, consequently, sudden cardiac death. The simultaneous use of fluconazole and erythromycin is contraindicated.

Amiodarone

: Concomitant use of fluconazole and amiodarone may also lead to inhibition of amiodarone metabolism. Amiodarone use has been associated with QT prolongation. The simultaneous use of fluconazole and amiodarone is contraindicated (see section "Contraindications").

Caution and possible dosage adjustments should be used when the following drugs are used concomitantly with fluconazole:

Drugs affecting fluconazole

Hydrochlorothiazide

: repeated use of hydrochlorothiazide simultaneously with fluconazole leads to an increase in the concentration of fluconazole in the blood plasma by 40%. An effect of this severity does not require a change in the fluconazole dosage regimen in patients receiving concomitant diuretics, but the doctor should take this into account.

Rifampicin

: Concomitant use of fluconazole and rifampicin leads to a decrease in AUC by 25% and the half-life of fluconazole by 20%. In patients concomitantly taking rifampicin, it is necessary to consider the advisability of increasing the dose of fluconazole.

Drugs affected by fluconazole

Fluconazole is a potent inhibitor of the cytochrome P450 isoenzyme CYP2C9 and CYP2C19 and a moderate inhibitor of the CYP3A4 isoenzyme. In addition, in addition to the effects listed below, there is a risk of increased plasma concentrations of other drugs metabolized by the isoenzymes CYP2C9, CYP2C19 and CYP3A4 when taken simultaneously with fluconazole. In this regard, caution should be exercised when using these drugs simultaneously, and if such combinations are necessary, patients should be under close medical supervision. It should be taken into account that the inhibitory effect of fluconazole persists for 4-5 days after discontinuation of the drug due to the long half-life.

Alfentanil

: There is a decrease in clearance and volume of distribution, an increase in the half-life of alfentanil. This may be due to inhibition of the CYP3A4 isoenzyme by fluconazole. Alfentanil dosage adjustment may be required.

Amitriptyline, nortriptyline:

increase in effect. Concentrations of 5-nortriptyline and/or S-amitriptyline can be measured at the start of combination therapy with fluconazole and one week after initiation. If necessary, the dose of amitriptyline/nortriptyline should be adjusted.

Amphotericin B:

In studies in mice (including those with immunosuppression), the following results were observed: a small additive antifungal effect in systemic infection with
C. albicans
, no interaction in intracranial infection with
Cryptococcus neoformans
and antagonism in systemic infection with
A. fumigatus.
The clinical significance of these results is unclear.

Anticoagulants

: like other antifungal agents (azole derivatives), fluconazole, when used simultaneously with warfarin, increases prothrombin time (by 12%), and therefore bleeding may develop (hematomas, bleeding from the nose and gastrointestinal tract, hematuria, melena). In patients receiving coumarin anticoagulants, prothrombin time must be constantly monitored during therapy and for 8 days after simultaneous use.

The advisability of adjusting the warfarin dose should also be assessed.

Azithromycin

: with simultaneous oral use of fluconazole in a single dose of 800 mg with azithromycin in a single dose of 1200 mg, no pronounced pharmacokinetic interaction has been established between both drugs.

Benzodiazepines (short-acting):

After oral administration of midazolam, fluconazole significantly increases midazolam concentrations and psychomotor effects, and this effect is more pronounced after oral administration of fluconazole than when administered intravenously. If concomitant therapy with benzodiazepines is necessary, patients taking fluconazole should be monitored to assess the appropriateness of an appropriate reduction in the benzodiazepine dose.

While taking a single dose of triazolam. fluconazole increases the AUC of triazolam by approximately 50%, Cmax by 25-50% and half-life by 25-50% due to inhibition of triazolam metabolism. Triazolam dose adjustment may be necessary.

Carbamazepine

: fluconazole inhibits the metabolism of carbamazepine and increases the serum concentration of carbamazepine by 30%. The risk of carbamazepine toxicity must be taken into account. The need for carbamazepine dose adjustment based on concentration/effect should be assessed.

Calcium channel blockers:

Some calcium channel antagonists (nifedipine, isradipine, amlodipine, verapamil and felodipine) are metabolized by the CYP3A4 isoenzyme. Fluconazole increases the systemic exposure of calcium channel antagonists. Monitoring for the development of side effects is recommended.

Cyclosporine

: In patients with a transplanted kidney, the use of fluconazole at a dose of 200 mg/day leads to a slow increase in cyclosporine concentrations. However, with repeated doses of fluconazole at a dose of 100 mg/day, no changes in cyclosporine concentrations were observed in bone marrow recipients. When using fluconazole and cyclosporine simultaneously, it is recommended to monitor the concentration of cyclosporine in the blood.

Cyclophosphamide

: with simultaneous use of cyclophosphamide and fluconazole, an increase in serum concentrations of bilirubin and creatinine is observed. This combination is acceptable given the risk of increased bilirubin and creatinine concentrations.

Fentanyl

: There has been a report of one death possibly related to the concomitant use of fentanyl and fluconazole. The disturbances are believed to be related to fentanyl intoxication. Fluconazole has been shown to significantly prolong the clearance time of fentanyl. It should be borne in mind that an increase in the concentration of fentanyl can lead to depression of respiratory function.

Halofantrine

: Fluconazole may increase plasma concentrations of halofantrine due to inhibition of the CYP3A4 isoenzyme. When used simultaneously with fluconazole, as well as with other azole antifungal drugs, the development of ventricular tachysystolic arrhythmia of the “pirouette” type is possible, so their combined use is not recommended.

HMG-CoA reductase inhibitors:

with simultaneous use of fluconazole with HMG-CoA reductase inhibitors metabolized by the CYP3A4 isoenzyme (such as atorvastatin and simvastatin) or the CYP2D6 isoenzyme (such as fluvastatin), the risk of developing myopathy and rhabdomyolysis increases. If simultaneous therapy with these drugs is necessary, patients should be monitored to identify symptoms of myopathy and rhabdomyolysis. It is necessary to monitor the concentration of creatinine kinase. If there is a significant increase in creatinine kinase concentrations or if myopathy or rhabdomyolysis is diagnosed or suspected, therapy with HMG-CoA reductase inhibitors should be discontinued.

Losartan

: Fluconazole inhibits the metabolism of losartan to its active metabolite (E-31 74), which is responsible for most of the effects associated with angiotensin-P receptor antagonism. Regular monitoring of blood pressure is necessary.

Methadone

: Fluconazole may increase plasma concentrations of methadone. Methadone dose adjustment may be necessary.

Nonsteroidal anti-inflammatory drugs (NSAIDs)

: Flurbiprofen Cmax and AUC increased by 23% and 81%, respectively. Similarly, the Cmax and AUC of the pharmacologically active isomer [S-(+)-ibuprofen] increased by 15% and 82%, respectively, when fluconazole was administered simultaneously with racemic ibuprofen (400 mg).

With simultaneous use of fluconazole at a dose of 200 mg/day and celecoxib at a dose of 200 mg, the Cmax and AUC of celecoxib increase by 68% and 134%, respectively. In this combination, it is possible to reduce the dose of celecoxib by half.

Although there are no targeted studies, fluconazole may increase the systemic exposure of other NSAIDs metabolized by CYP2C9 (eg, naproxen, lornoxicam, meloxicam, diclofenac). NSAID dose adjustment may be necessary.

When NSAIDs and fluconazole are used concomitantly, patients should be closely monitored medically to identify and monitor NSAID-related adverse events and toxicities.

Oral contraceptives:

with simultaneous use of a combined oral contraceptive with fluconazole at a dose of 50 mg, no significant effect on hormone levels has been established, while with daily administration of 200 mg of fluconazole, the AUC of ethinyl estradiol and levonorgestrel increases by 40% and 24%, respectively, and when taking 300 mg of fluconazole once a day week, the AUC of ethinyl estradiol and norethindrone increased by 24% and 13%, respectively. Thus, repeated use of fluconazole at the indicated doses is unlikely to affect the effectiveness of the combined oral contraceptive.

Phenytoin

: Concomitant use of fluconazole and phenytoin may be accompanied by a clinically significant increase in phenytoin concentrations. If concomitant use of both drugs is necessary, phenytoin concentrations should be monitored and the dose adjusted accordingly to ensure therapeutic serum concentrations.

Prednisone

: There is a report of the development of acute adrenal insufficiency in a patient after liver transplantation upon discontinuation of fluconazole after a three-month course of therapy. Presumably, discontinuation of fluconazole therapy caused an increase in the activity of the CYP3A4 isoenzyme, which led to increased metabolism of prednisone.

Patients receiving combination therapy with prednisone and fluconazole should be under close medical supervision when discontinuing fluconazole to assess the condition of the adrenal cortex.

Rifabutin

: simultaneous use of fluconazole and rifabutin can lead to an increase in serum concentrations of the latter by up to 80%. Cases of uveitis have been described with the simultaneous use of fluconazole and rifabutin. Patients receiving rifabutin and fluconazole concomitantly should be monitored closely.

Saquinavir

: AUC increases by approximately 50%, Cmax by 55%, clearance of saquinavir decreases by approximately 50% due to inhibition of hepatic metabolism of the CYP3A4 isoenzyme and inhibition of P-glycoprotein. Dose adjustment of saquinavir may be necessary.

Sirolimus

: increased plasma concentrations of sirolimus, presumably due to inhibition of sirolimus metabolism through inhibition of the CYP3A4 isoenzyme and P-glycoprotein. This combination can be used with appropriate dose adjustment of sirolimus depending on the effect/concentration.

Sulfonylureas:

Fluconazole, when administered concomitantly, leads to an increase in the half-life of oral sulfonylureas (chlorpropamide, glibenclamide, glipizide and tolbutamide). Patients with diabetes mellitus can be prescribed the combined use of fluconazole and oral sulfonylureas, but the possibility of hypoglycemia should be taken into account, in addition, regular monitoring of blood glucose is necessary and, if necessary, dose adjustment of sulfonylureas.

Tacrolimus

: simultaneous use of fluconazole and tacrolimus (orally) leads to an increase in serum concentrations of the latter by 5 times due to inhibition of the metabolism of tacrolimus occurring in the intestine through the CYP3A4 isoenzyme. No significant changes in the pharmacokinetics of the drugs were observed when tacrolimus was administered intravenously. Cases of nephrotoxicity have been described. Patients receiving oral tacrolimus and fluconazole concomitantly should be monitored closely. The dose of tacrolimus should be adjusted depending on the degree of increase in its concentration in the blood.

Theophylline

: When used simultaneously with fluconazole at a dose of 200 mg for 14 days, the average rate of plasma clearance of theophylline is reduced by 18%. When prescribing fluconazole to patients taking high doses of theophylline or to patients at increased risk of developing theophylline toxicity, monitor for symptoms of theophylline overdose and, if necessary, adjust therapy accordingly.

Vinca alkaloid

: Although focused studies are lacking, it is suspected that fluconazole may increase plasma concentrations of vinca alkaloids (eg, vincristine and vinblastine) and thus lead to neurotoxicity, which may be due to inhibition of CYP3A4.

Vitamin A:

There is a report of one case of the development of adverse reactions from the central nervous system (CNS) in the form of pseudotumor cerebri with the simultaneous use of all-trans retinoic acid and fluconazole, which disappeared after discontinuation of fluconazole. The use of this combination is possible, but one should remember the possibility of adverse reactions from the central nervous system.

Zidovudine

: When used simultaneously with fluconazole, an increase in Cmax and AUC of zidovudine is observed by 84% and 74%, respectively. This effect is probably due to a decrease in the metabolism of the latter to its main metabolite. Before and after therapy with fluconazole at a dose of 200 mg/day for 15 days in patients with AIDS and ARC (AIDS-related complex), a significant increase in the AUC of zidovudine (20%) was found.

Patients receiving this combination should be monitored for side effects of zidovudine.

Voriconazole (inhibitor of CYP2C9, CYP2C19 and CYP3A isoenzymes4)

: simultaneous use of voriconazole (400 mg 2 times daily on the first day, then 200 mg twice daily for 2.5 days) and fluconazole (400 mg on the first day, then 200 mg daily for 4 days ) leads to an increase in voriconazole concentration and AUC by 57% and 79%, respectively. It has been shown that this effect persists when the dose is reduced and/or the frequency of administration of any of the drugs is reduced. Concomitant use of voriconazole and fluconazole is not recommended.

Studies of the interaction of oral forms of fluconazole when taken simultaneously with food, cimetidine, antacids, as well as after total body irradiation in preparation for bone marrow transplantation showed that these factors do not have a clinically significant effect on the absorption of fluconazole.

Tofacitinib

: The exposure of tofacitinib is increased when it is co-administered with drugs that are both moderate inhibitors of the CYP3A4 isoenzyme and strong inhibitors of the CYP2C19 isoenzyme (for example, fluconazole). Dose adjustment of tofacitinib may be necessary.

Ivacaftor

When coadministered with ivacaftor, a cystic fibrosis transmembrane conductance regulator (CFTR) stimulator, there was a 3-fold increase in ivacaftor exposure and a 1.9-fold increase in hydroxymethyl-ivacaftor (MI) exposure. For patients taking moderate CYP3A inhibitors concomitantly, such as fluconazole and erythromycin, a dose reduction of ivacaftor to 150 mg once daily is recommended.

The listed interactions were established with repeated use of fluconazole; There are no known drug interactions resulting from a single dose of fluconazole.

Doctors should note that interactions with other drugs have not been specifically studied, but are possible.