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*Urinary retention <ref>Overall, K.L. 2001. Pharmacological Treatment in Behavioural Medicine: The Importance of Neurochemistry, Molecular Biology and Mechanistic Hypotheses. The Veterinary Journal, 162, 9-23</ref>.
 
*Urinary retention <ref>Overall, K.L. 2001. Pharmacological Treatment in Behavioural Medicine: The Importance of Neurochemistry, Molecular Biology and Mechanistic Hypotheses. The Veterinary Journal, 162, 9-23</ref>.
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===Interactions===
 
'''Care should be taken if used in conjunction with any of the following drugs, which may interact and cause adverse effects:'''
 
'''Care should be taken if used in conjunction with any of the following drugs, which may interact and cause adverse effects:'''
 
*Morphine: enhanced analgesia and respiratory depression.
 
*Morphine: enhanced analgesia and respiratory depression.
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*Thyroid medications: can interfere, therefore if simultaneously used must be carefully monitored <ref>Gullikers, K.P., Panciera, D.L., 2002. Influence of various medications on canine thyroid function. Compendium of Continuing Education for the Practicing Veterinarian 24, 511-521</ref>
 
*Thyroid medications: can interfere, therefore if simultaneously used must be carefully monitored <ref>Gullikers, K.P., Panciera, D.L., 2002. Influence of various medications on canine thyroid function. Compendium of Continuing Education for the Practicing Veterinarian 24, 511-521</ref>
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If the drug is overdosed/combined with an inappropriate drug (see above) an increased sedation and degree of adverse effects as listed will be seen. If the drug dose is persistently high or the drug is combined with an MAOI, serotonin syndrome is a possible consequence:
+
'''Care should be taken if used in conjunction with any of the following drugs, which may interact and cause adverse effects:'''
 +
*Fluoxetine should not be given at the same time as drugs which lower seizure threshold eg. phenothiazines such as acepromazine or chlorpromazine.
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*Monoamine oxidase inhibitors (MAOI), or within a period of 2 weeks after discontinuation of treatment with a MAOI due to the risk of serotonin syndrome<ref>Brown, T.M., Skop, B.P., Mareth, T.R., 1996. Pathophysiology and management of the serotonin syndrome. The Annals of Pharmacotherapy 30, 527–533.</ref>
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*Fluoxetine has not been evaluated with drugs that affect the cytochrome P450 enzyme, care should therefore be taken with any drug that affects the enzyme system eg. ketoconazole.
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===Serotonin syndrome===
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If an SRI, SSRI or TCA is overdosed or combined with another serotonergic drug (see above) an increased level of sedation and adverse effects will be observed. There is also the possibility of serotonin syndrome, especially if one of these drugs is given with an MAOI (e.g. selegiline). Signs include:
 
*Gastrointestinal distress
 
*Gastrointestinal distress
 
*Head pain
 
*Head pain
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