What drugs interact with Zoloft and Paxil?

Zoloft

All SSRIs, including Zoloft, should not be taken with any of the monoamine oxidase inhibitor (MAOI) class of antidepressants, for example

  • isocarboxazid (Marplan),
  • phenelzine (Nardil),
  • tranylcypromine (Parnate),
  • selegiline (Eldepryl, Emsam, Elazar), and
  • procarbazine (Matulane).

Other drugs that inhibit monoamine oxidase include

Such combinations may lead to confusion, high blood pressure, tremor, hyperactivity, coma, and death. (A period of 14 days without treatment should lapse when switching between Zoloft and MAOIs.) Similar reactions occur when Zoloft is combined with other drugs — for example, tryptophan, St. John’s wort, meperidine (Demerol, Meperitab), tramadol (ConZip, Synapryn FusePaq, Ultram) — that increase serotonin in the brain.

Cimetidine (Cimetidine Acid Reducer, Tagamet HB ) may increase the levels in blood of Zoloft by reducing the elimination of Zoloft by the liver. Increased levels of Zoloft may lead to more side effects.

Zoloft increases the blood level of pimozide (Orap) by 40%. High levels of pimozide can affect electrical conduction in the heart and lead to sudden death. Therefore, patients should not receive treatment with both pimozide and Zoloft.

Through unknown mechanisms, Zoloft may increase the blood thinning action of warfarin (Coumadin, Jantoven). The effect of warfarin should be monitored when Zoloft is started or stopped.

Paxil

All SSRIs, including Paxil, should not be taken with any of the monoamine oxidase inhibitor (MAOI) class of antidepressants — for example, isocarboxazid (Marplan), phenelzine (Nardil), tranylcypromine (Parnate), selegiline (Eldepryl, Carbex), and procarbazine (Matulane) — or other drugs that inhibit monoamine oxidase such as linezolid (Zyvox) and intravenous methylene blue.

Such combinations may lead to confusion, high blood pressure, tremor, hyperactivity, coma, and death. (A period of 14 days without treatment should lapse when switching between Paxil and MAOIs.) Similar reactions occur when Paxil is combined with other drugs — for example, tryptophan, St. John’s wort, meperidine (Demerol), tramadol (Ultram) — that increase serotonin in the brain.

Paxil may increase the effect of the blood thinner, warfarin (Coumadin), leading to excessive bleeding. Therefore, warfarin therapy should be monitored more frequently in patients who are also taking Paxil. Combining SSRIs such as Paxil with aspirin, nonsteroidal anti-inflammatory drugs or other drugs that affect bleeding may increase the likelihood of upper gastrointestinal bleeding. Phenytoin (Dilantin) and phenobarbital may decrease the amount of Paxil in the body and possibly reduce its effectiveness.