The current study intends to look at the impact of the fluoxetine hydrochloride on specific tissues lung and pancreas of mature pregnant mice. The two doses used during the study were 45,75mg/kg b.w. from the 7th to the 17th day of pregnancy. Experimental animals received fluoxetine orally at a dosage of 45mg/kg b.w. The findings indicate variable pathologic changes in the lungs. At the dose of 75 mg/kg b.w. hyperplasia of pneumocytes occurred. In the pancreas, there were no detectible lesions at the dose of 45mg/kg b.w. while at the dose of 75 mg/kg b.w. the severity of tissue lesions was seen. In conclusion, antidepressants may stimulate oxidative injury throughout the body's internal organs, particularly if taken at high doses during pregnancy. Consequently, these lesions have a great impact on the heath of both fetus and pregnant mice since the most common lesions were observed in fetus which cause abortion which effect on the health of pregnant mice.