Abstract:
:Anticonvulsants are associated with decreased serum thyroid hormone concentrations. We have studied thyroid function in 54 epileptic patients on a variety of drugs (19 on carbamazepine, 13 on phenytoin, 10 on sodium valproate, 12 on polypharmacy). For comparison, 14 untreated epileptics and 11 healthy unmedicated volunteers were included as controls. Total thyroxine (T4) concentrations were reduced in patients taking enzyme-inducing drugs (carbamazepine and/or phenytoin) compared with both controls and patients taking sodium valproate. Similar differences were shown with each individual drug. All nine patients whose circulating T4 was below the lower limit of the reference range were taking enzyme inducers. Free thyroxine concentrations were also reduced in individuals treated with carbamazepine and phenytoin with five values falling beneath the reference range. Tri-iodothyronine and thyrotropin appeared unaffected by anticonvulsant administration. Thyrotropin releasing hormone stimulation revealed no true hypothyroidism. The lowering effect of anticonvulsant drugs on circulating total and free T4 was not exhibited by the non-inducing sodium valproate. These data support the influence of enzyme induction as a likely mechanism for reduced thyroxine concentrations in treated epileptic patients.
journal_name
Eur J Clin Pharmacoljournal_title
European journal of clinical pharmacologyauthors
Larkin JG,Macphee GJ,Beastall GH,Brodie MJdoi
10.1007/BF00558149subject
Has Abstractpub_date
1989-01-01 00:00:00pages
213-6issue
3eissn
0031-6970issn
1432-1041journal_volume
36pub_type
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journal_title:European journal of clinical pharmacology
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journal_title:European journal of clinical pharmacology
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journal_title:European journal of clinical pharmacology
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journal_title:European journal of clinical pharmacology
pub_type: 杂志文章
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更新日期:1994-01-01 00:00:00
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pub_type: 临床试验,杂志文章
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