Retin-A and Tazorac?

Is it okay to alternate nightly usage of Retin-A and Tazorac? I've been using Retin-A with no side effects and was curious to see if I can use it every other night, and the Tazorac on the skipped nights. I've used Tazorac in the past also experienced no side effects. How effective are these 2 products when used in conjunction as a regime but not together at the same time?

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