Flomax and PCE Dispertab

In the database of official manuals used in the service creation an interaction registered by statistical results of studies was found, which can either lead to negative consequences for the patient health or strengthen a mutual positive effect. A doctor should be consulted to address the issue of joint drug administration.

Erythromycin may increase the blood levels and effects of tamsulosin. This can cause blood pressure to fall excessively and heart rate to increase, especially when you rise from a sitting or lying position. The risk of other side effects such as dizziness, lightheadedness, fainting, headache, flushing, nasal congestion, heart palpitations, and priapism (prolonged and painful erection unrelated to sexual activity) may also increase. You may need a dose adjustment or more frequent monitoring by your doctor to safely use both medications. Let your doctor know if you develop these symptoms while using tamsulosin and they do not go away on their own or they become troublesome. Avoid driving or operating hazardous machinery until you know how the medication affects you, and use caution when getting up from a sitting or lying position. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.

MONITOR: Coadministration with inhibitors of CYP450 3A4 and/or 2D6 may increase the plasma concentrations of tamsulosin, which is primarily metabolized in the liver by these isoenzymes. In 24 healthy volunteers, administration of a single 0.4 mg dose of tamsulosin with the potent CYP450 3A4 inhibitor ketoconazole (400 mg once daily for 5 days) resulted in a 2.2-fold increase in tamsulosin peak plasma concentration (Cmax) and a 2.8-fold increase in systemic exposure (AUC) compared to administration alone. Likewise, concomitant treatment with the potent CYP450 2D6 inhibitor paroxetine (20 mg once daily for 9 days) resulted in an increase in the Cmax and AUC of a single 0.4 mg dose of tamsulosin by a factor of 1.3 and 1.6, respectively. The effects of concomitant administration of a moderate CYP450 3A4 inhibitor such as erythromycin or a moderate CYP450 2D6 inhibitor such as terbinafine on the pharmacokinetics of tamsulosin have not been evaluated. The effects of coadministration of both a CYP450 3A4 and a CYP450 2D6 inhibitor have also not been evaluated. However, there is a potential for significant increase in tamsulosin exposure relative to coadministration with either inhibitor alone. Similarly, a significant increase in exposure may occur when tamsulosin is administered with a CYP450 3A4 inhibitor to individuals who have genetic polymorphisms of CYP450 2D6 resulting in reduced or absent enzyme activity, or so-called CYP450 2D6 poor metabolizers (approximately 7% of Caucasians and less than 2% of Asians and individuals of African descent).

MANAGEMENT: Caution is advised if tamsulosin is used concomitantly with moderate CYP450 3A4 inhibitors (e.g., amiodarone, aprepitant, diltiazem, dronedarone, erythromycin, fluconazole, fluvoxamine, fusidic acid, imatinib, isavuconazonium, verapamil) and/or moderate to potent CYP450 2D6 inhibitors (e.g., abiraterone, bupropion, celecoxib, cinacalcet, darifenacin, dronedarone, duloxetine, fluoxetine, lorcaserin, paroxetine, propafenone, quinidine, ranolazine, rolapitant, terbinafine), particularly at a dosage higher than 0.4 mg/day. The potential for increased risk of adverse effects such as postural hypotension, syncope, and priapism should be considered. Patients should be advised to avoid rising abruptly from a sitting or recumbent position, and to notify their physician if they experience dizziness, lightheadedness, syncope, orthostasis, or tachycardia. Patients should also avoid driving or operating hazardous machinery until they know how the medication affects them.

Flomax

Generic Name: tamsulosin

Brand name: Flomax

Synonyms: n.a.

What is Flomax?

PCE Dispertab

Generic Name: erythromycin

Brand name: EES. Granules, EES-400 Filmtab, EryPed 200, EryPed 400, Ery-Tab, Erythrocin Lactobionate, Erythrocin Stearate Filmtab, PCE Dispertab, E. E. S, EryPed, Erythrocin, Erythromycin Filmtabs, Erythromycin Lactobionate - IV

Synonyms: PCE Dispertab (Oral), PCE, PCE (Oral)

What is PCE Dispertab?