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Adderall XR and Terbinex

Determining the interaction of Adderall XR and Terbinex and the possibility of their joint administration.

Check result:

Adderall XR <> Terbinex

Relevance: 05.10.2022 Reviewer: Shkutko P.M., M.D., in

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.

Consumer:

Terbinafine may increase the blood levels and effects of amphetamine, even up to several months after you've stopped taking terbinafine. You may need a dose adjustment or more frequent monitoring by your doctor to safely use both medications. Contact your doctor if your condition changes or you experience increased side effects. 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.

Professional:

MONITOR: Coadministration with terbinafine may increase the plasma concentrations of drugs that are substrates of the CYP450 2D6 isoenzyme. The mechanism is decreased clearance due to inhibition of CYP450 2D6 activity by terbinafine, which is expected to occur in patients who are CYP450 2D6 extensive metabolizers (approximately 93% of Caucasians and more than 98% of Asians and individuals of African descent). A case of nortriptyline (a CYP450 2D6 substrate) intoxication corresponding to significantly increased serum drug concentrations was reported in a patient shortly after the addition of terbinafine. Rechallenge in the patient produced similar results.

MANAGEMENT: Caution is advised if terbinafine must be used concurrently with medications that undergo metabolism by CYP450 2D6, particularly those with a narrow therapeutic range. Dosage adjustments as well as clinical and laboratory monitoring may be appropriate for some drugs whenever terbinafine is added to or withdrawn from therapy. Due to the long elimination half-life of terbinafine, especially following prolonged use, such interactions may be observed for several months after discontinuation of terbinafine therapy.

References

Van der Kuy PH, Hooymans PM, Verkaaik AJ "Nortriptyline intoxication induced by terbinafine." BMJ 316 (1998): 441
"Product Information. Lamisil (terbinafine)." Sandoz Pharmaceuticals Corporation, East Hanover, NJ.
AbdelRahman SM, Gotschall RR, Kauffman RE, Leeder JS, Kearns GL "Investigation of terbinafine as a CYP2D6 inhibitor in vivo." Clin Pharmacol Ther 65 (1999): 465-72
Gupta AK, Katz HI, Shear NH "Terbinafine and potential drug interactions - Reply." J Am Acad Dermatol 43 (2000): 883-4

Adderall XR

Generic Name: amphetamine / dextroamphetamine

Brand name: Adderall, Adderall XR, Mydayis

Synonyms: n.a.

What is Adderall XR?

Terbinex

Generic Name: terbinafine

Brand name: Terbinex, Lamisil

Synonyms: n.a.

What is Terbinex?

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In the course of checking the drug compatibility and interactions, data from the following reference sources was used: Drugs.com, Rxlist.com, Webmd.com, Medscape.com.

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