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Drug Interactions between aminophylline / ephedrine / guaifenesin / phenobarbital and atrasentan

This report displays the potential drug interactions for the following 2 drugs:

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Interactions between your drugs

Major

PHENobarbital atrasentan

Applies to: aminophylline / ephedrine / guaifenesin / phenobarbital and atrasentan

Consumer information for this interaction is not currently available.

GENERALLY AVOID: Coadministration with potent or moderate inducers of CYP450 3A4 may significantly decrease the plasma concentrations of atrasentan, which is primarily metabolized by the isoenzyme. In drug interaction studies, coadministration with the potent CYP450 3A4 inducer rifampin reduced atrasentan (single dose, 10 mg) trough plasma concentration (Ctrough) by 90%. Rifampin is also an inhibitor of the hepatic influx transporters organic anion transporting polypeptides (OATP) 1B1 and 1B3, of which atrasentan is a substrate. No data are available about potent or moderate CYP450 3A4 inducers that do not inhibit OATP1B1 and/or 1B3, but greater decreases in atrasentan exposure may occur.

MANAGEMENT: Concomitant use of atrasentan with potent or moderate CYP450 3A4 inducers should generally be avoided.

Moderate

PHENobarbital aminophylline

Applies to: aminophylline / ephedrine / guaifenesin / phenobarbital and aminophylline / ephedrine / guaifenesin / phenobarbital

Using PHENobarbital together with aminophylline may decrease the effects of aminophylline. Contact your doctor if your condition changes or if you experience breathing difficulties. If your doctor does prescribe these medications together, you may need a dose adjustment or special test to safely use both medications. 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.

Minor

ePHEDrine aminophylline

Applies to: aminophylline / ephedrine / guaifenesin / phenobarbital and aminophylline / ephedrine / guaifenesin / phenobarbital

Information for this minor interaction is available on the professional version.

Drug and food interactions

Major

PHENobarbital food

Applies to: aminophylline / ephedrine / guaifenesin / phenobarbital

Ask your doctor before using PHENobarbital together with ethanol (alcohol), this can add to dizziness, drowsiness and other side effects of PHENobarbital. Be careful if you drive or do activities that require you to be awake and alert. Talk with your doctor before using any medications together, or drinking alcohol with PHENobarbital. 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.

Moderate

ePHEDrine food

Applies to: aminophylline / ephedrine / guaifenesin / phenobarbital

Both ePHEDrine and caffeine can increase blood pressure and heart rate, and combining them may enhance these effects. Talk to your doctor before using these medications, especially if you have a history of high blood pressure or heart disease. 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.

Moderate

aminophylline food

Applies to: aminophylline / ephedrine / guaifenesin / phenobarbital

Both aminophylline and caffeine can increase blood pressure and heart rate, and combining them may enhance these effects. Talk to your doctor before using these medications, especially if you have a history of high blood pressure or heart disease. 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.

Therapeutic duplication warnings

No warnings were found for your selected drugs.

Therapeutic duplication warnings are only returned when drugs within the same group exceed the recommended therapeutic duplication maximum.

See also

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Drug Interaction Classification

These classifications are only a guideline. The relevance of a particular drug interaction to a specific individual is difficult to determine. Always consult your healthcare provider before starting or stopping any medication.
Major Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit.
Moderate Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.
Minor Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan.
Unknown No interaction information available.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

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