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PFIPriority for Improvement (various organizations)
PFIPower Factor Improvement
PFIPrison Fellowship International
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PFIPractical Farmers of Iowa
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PFIPerformance Feel Index (automotive engineering)
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PFIPerformance Factor Interview
PFIPill-Free Interval (combined oral contraceptive pill)
PFIPower Fail Interrupt
PFIPayload FCS (Frame Check Sequence) Indicator
PFIPurolator Facet, Inc. (Franklin, TN)
PFIPastoral Formation Institute
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References in periodicals archive ?
Users should ask their doctors about avoiding the pill-free interval.
Known as the pill-free interval, the placebos are designed to be taken the week you have your period to help you stay in the rhythm of taking a pill every day.
Should the first 2 weeks of antibiotic use extend into the last 7 days of the pack, eliminate the next pill-free interval as well.
There is no reason why women have to have a seven-day pill-free interval," sexual health physician Terri Foran said.
Shortened pill-free interval delivered by new 20 mcg pill, Organon's Mircette, schedule for US debut this summer.
The 7-day pill-free interval, combined with a delay in restarting the next phase of the pill regimen, is the likely cause of some of the unintended pregnancies reported in pill users.
Legro and his coinvestigators en rolled 62 normally cycling women in a double-blind, randomized, controlled trial and followed them for symptoms, bleeding patterns, endometrial histology, follicular development, and serum and urinary levels of sex steroids as they took oral contraceptives for 28 days per month with the traditional Z-day pill-free interval or continuously
headaches including nonfocal migraine, menstrual migraine and other bothersome side effects, if they occur during the pill-free interval
A total of 278 women with a history of cycle-related symptoms or dysmenorrhea were monitored during three cycles of the COC regimen, with no pill-free interval.
In the usual OC cycle of 21 hormone days and 7 days off, women begin to get symptomatic even before the pill-free interval because their ovaries are not totally suppressed," she said in an interview, "By giving an extended number of days of hormone, you have better ovarian suppression and thus fewer symptoms during the shorter pill-free interval.
An oral contraceptive regimen consisting of 84 days of hormonally active pills followed by a seven-day pill-free interval could be less costly to users and society than the standard regimen of 27 days of active pills followed by a weeklong pill-free interval.
Three weeks of use are followed by a patch-free week to allow for menses (much like the pill-free interval for most COCs).