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ED Medication dosage question

I am considering switching from Levitra to Cialis.  Have read that Cialis has a longer half life (up to 36 hrs vs. 5-7 hrs.).  Anyway, I have tried extending Levitra's half-life by taking a second dosage a few hours later, but no matter what, the max effects still really fade off 5-7 hours after the initial dosage.  Wondering if anyone knows why this might be... and why a second dose would not extend the effects?  Just helps with planning.
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139792 tn?1498585650
I think pharmacological study of extending effect of a drug may help to understand this effect.
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