How do I use 「~さえ~ば」 properly?

PUBLIC_FLAG_#{@journal.pf_int} RSS feed of InvisiblebiRON's latest journal entries Dec 23rd 2009 11:35

How do I decide between using:

薬さえ飲めば
薬を飲みさえすれば
薬を飲んでさえいれば

I think I understand the first 2 differ because of emphasis, but what about 「飲んでさえいれば」?

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