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| __NOTOC__
| | #REDIRECT [[Guanfacine#Drug Interactions]] |
| {{Guanfacine}}
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| {{CMG}}; {{AE}} {{SS}}
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| ==Drug Interactions==
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| The potential for increased sedation when Tenex is given with other CNS-depressant drugs should be appreciated.
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| The administration of guanfacine concomitantly with a known microsomal enzyme inducer (phenobarbital or phenytoin) to two patients with renal impairment reportedly resulted in significant reductions in elimination half-life and plasma concentration. In such cases, therefore, more frequent dosing may be required to achieve or maintain the desired hypotensive response. Further, if guanfacine is to be discontinued in such patients, careful tapering of the dosage may be necessary in order to avoid rebound phenomena (see Rebound above).
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| ===Anticoagulants===
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| Ten patients who were stabilized on oral anticoagulants were given guanfacine, 1 - 2 mg/day, for 4 weeks. No changes were observed in the degree of anticoagulation.
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| In several well-controlled studies, guanfacine was administered together with diuretics with no drug interactions reported. In the long-term safety studies, Tenex was given concomitantly with many drugs without evidence of any interactions. The principal drugs given (number of patients in parentheses) were: cardiac glycosides (115), [[sedatives]] and [[hypnotics]] (103), coronary vasodilators (52), oral hypoglycemics (45), cough and cold preparations (45), NSAIDs (38), antihyperlipidemics (29), antigout drugs (24), oral contraceptives (18), [[bronchodilators]] (13), [[insulin]] (10), and [[beta blockers ]](10).<ref name="dailymed.nlm.nih.gov">{{Cite web | last = | first = | title = TENEX (GUANFACINE HYDROCHLORIDE) TABLET [PROMIUS PHARMA, LLC] | url = http://dailymed.nlm.nih.gov/dailymed/lookup.cfm?setid=886e050c-dd22-4f35-ac3b-243f091125c3#nlm34067-9 | publisher = | date = | accessdate = 25 February 2014 }}</ref>
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| ==References==
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| {{reflist|2}}
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| {{Antihypertensives and diuretics}}
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| {{Antihyperkinetics}}
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| {{Adrenergics}}
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| [[Category:Antihypertensive agents]]
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| [[Category:Guanidines]]
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| [[Category:Alpha-adrenergic agonists]]
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| [[Category:Acetamides]]
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| [[Category:Organochlorides]]
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| [[Category:Cardiovascular Drugs]]
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| [[Category:Drugs]]
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