Both over-the-counter (OTC) and prescription analgesics-antipyretics like ibuprofen which is nonsteroidal anti-inflammatory drugs (NSAIDs) have effective as well as safe use for long time. Reversible inhibition of cyclooxy genase enzymes is the mode of action of NSAIDs over all. Use of NSAID lead to drug adverse reactions such as cardiovascular and gastrointestinal bleeding also effects of renal. Drug-drug interactions (DDIs) within the NSAID and a concomitant medication cause adverse drug reaction to several cases. DDIs have been reported for example, when commonly used medica tions as well as some antihypertensive, alcohol, aspirin, antidepressants are coadministered with NSAIDs. Dependent on total drug exposure cause a continuous risk in that the potential for an ADR due to interactions pharmacologic nature. When assessing ADRs potential risk is important to consideration the use of NSAID dose and duration, also the comedication type or class administered. The sub acute toxicity were carried out on thirty mice divided to three equally groups (10 mice in sub group) which were dosed for two weeks daily as follows: group one (control) was givin distilled water, the group two was get diclofenac (voltaren) (100mg/kg B.W.) and group three was givin diclofenac (voltaren) with aspirin (100mg/kg B.W.) for each together. Clinical signs of toxicity appear as following: abdominal pain, nausea, dizziness, anorexia, ataxia, blueness of the chest area, shortness of breath and Paralysis of the posterior limbs and recumbence, finally the death of mouse. Serum liver enzyme (ALT and AST) were elevated in all groups (diclofenac and diclofenac with aspirin) as compare to control after two weeks. Considering histopathological studies of liver tissue after two weeks of daily treatment, which showed moderated mononuclear cells infiltration in portal area around blood vessels and bile duct for voltaren group and fatty vacuoles in the cytoplasm of hepatic cells, single cells necrosis and severe inflammatory cells infiltration in the capsular area for voltaren with aspirin group. We concluded that diclofenac and diclofenac with aspirin have toxic effect appear by clinical symptoms and damage to liver, furthermore, don't administration of more than one NSAID at same time.