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The following adverse reactions have been reported associated with the use of Technetium Tc 99m Sulfur Colloid Injection: cardiopulmonary arrest, seizures, anaphylactic shock, hypotension, dyspnea, abdominal pain, fever, chills, bronchospasm, nausea, vomiting, perspiration, redness, urticaria, numbness, dizziness and burning at the injection site.

Several deaths and cases of lung and soft tissue uptake other than RES have been reported in association with the use of Technetium Tc 99m Sulfur Colloid Injection (see WARNINGS).

The size and physical-chemical properties of the sulfur colloid particles formed from the components of the kit may determine the biodistribution of the colloid and its uptake by the RE system. Diseases affecting the RE system may also alter the expected uptake pattern.