Is Retin A (Retin-A Micro aka Tretinoin) still effective if used every other night, instead of every single night? (photo)

I have been taking Retin-A for 30 days. I wait 30 minutes after washing and then apply it, then moisturizer on top. Side effects are mild but my face feels tight when I smile and I have some redness. Will retin-a still be effective if I take it every other night? My side effects are not too bad, but if Retin-A is just as effective, then I would rather take it every other night and lower the side effects even more. Or should I just push through and take it every night? Thanks!

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