Victoria Principal Introduction Victoria Principal, born January 3, 1950, is best known for her role as Larry Hagman's sister-in-law and Patrick Duffy's wife, Pamela Barnes Ewing, Pam, on the long-running CBS nighttime drama Dallas from 1978 to 1987.
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1 For most patients the recommended starting dose is 10 mg as needed prior to anticipated sexual activity. 2  The dose may be increased to 20 mg or decreased to 5 mg based on efficacy or tolerability. 3  The maximum dosing frequency is once daily for most patients. 4  Cialis is effective for up to 36 hours.