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Ampicillin/sulbactam is a combination of the common penicillin-derived antibiotic ampicillin and sulbactam, an inhibitor of bacterial beta-lactamase. Two different forms of the drug exist. The first, developed in 1987 and marketed in the United States under the tradename Unasyn, generic only outside of the United States, is an intravenous antibiotic. The second, an oral form called sultamicillin, is marketed under the trade name Ampictam outside of the United States. And generic only in the United States, ampicillin/sulbactam is used to treat infections caused by bacteria resistant to beta-lactam antibiotics. Sulbactam blocks the enzyme which breaks down ampicillin and thereby allows ampicillin to attack and kill the bacteria.

Adverse drug effects

Reported adverse events include both local and systemic reactions. Local adverse reactions are characterized by redness, tenderness, and soreness of the skin at the injection site. The most common local reaction is injection site pain. It has been reported to occur in 16% of patients receiving intramuscular injections, and 3% of patients receiving intravenous injections. Less frequently reported side effects include inflammation of veins (1.2%), sometimes associated with a blood clot (3%). The most commonly reported systemic reactions are diarrhea (3%) and rash (2%). Less frequent systemic reactions to ampicillin/sulbactam include chest pain, fatigue, seizure, headache, painful urination, urinary retention, intestinal gas, nausea, vomiting, itching, hairy tongue, tightness in throat, reddening of the skin, nose bleeding, and facial swelling. These are reported to occur in less than 1% of patients.

On Jan, 29, 2016: 3,335 people reported to have side effects when taking Unasyn. Among them, 33 people (0.99%) have Hallucination.

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On Feb, 13, 2016: 3,335 people reported to have side effects when taking Unasyn. Among them, 71 people (2.13%) have Death.

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