The purpose of this clinical study is to determine the response to two different dosage strengths of a topical nitroglycerin gel in patients with Raynaud's Phenomenon. Patient fingers will be monitored for changes in blood flow and skin temperature. Symptoms of pain, tingling and numbness will also be monitored.
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Changes in blood flow in the fingers of the non-dominant hand after the induction of constriction of blood vessels by exposure to local cold temperatures.
Timeframe: 130 minutes