With my last IVF cycle, the PIO I got lasts for several months before it expires. However, the information I received said that I should discard any remaining in an open vial after so many days (I think it was 30 days, but it could have been less).
ETA - I meant to add: So, you should check with your pharmicist.
Me= 37 and DH = 41 Dx: DOR, Endo, APA+ (really high beta 2 glycoprotein antibody and high everything else tested), heterozygous MTHFR mutation, positive for lupus anticoagulant, high FSH, low AMH and both tubes blocked (per HSG on 3/8/11) IVF #1 - long lupron (with HGH, intralipids, lovenox and BA); 4 retrieved, 3 fertilized; ET 2 blasts and 1 frozen = BFN IVF #2 - a version of antagonist with EPP (with HGH, intralipids, lovenox and BA); 6 retrieved, 4 mature, 3 fertilized, 2 blasts and 1 frozen blast transferred on day 5 = BFN. IVF #3 April was postponed to May, May was canceled. June/July was canceled. Had a cyst aspiration and then began IVF #3 in August. ER on 8/22; ET on 8/24 with AH. +HPT on 9/5. Beta #1 (11dpo) = 3; Beta #2 (15dpo) = 29; Beta #3 (17dpo) = 60; Beta #4 (19 dpo) = 118. Heartbeat at 6 weeks 6 days =132. Lil is here!
TTC#2: Trigger + TI = BFN; Clomid + Trigger + IUI = BFN.
IVF #4: BCP + MDLF + Lovenox = 7R, 1F = Transferred 1 6-cell embryo on day 3 = BFN
IVF #5: MDLF + Lovenox = 4R, 1F = Transferred 1 10-cell compacting embryo on day 3 = BFN
IVF #6: (New RE): Long Antagonist November 2014 (transferred two 8 cell grade 1 embryos and froze one blast) = BFN
once vial is punctured PIO is good for 30, if it is PIO in ethyl oleate 28 days