I Believe your asking about a relaxer.. You can switch the relaxer you are using with care. Make sure you are due for a touch up and give your hair a conditioning treatment afterwards.
Use moisturizing products to maintain the hair as well as keeping your hair trimmed to keep hair as strong as possible. You don't want breakage weeks later because of dryness.
(Relaxed hair must be properly moisturized..always.)
Many people successfully switch relaxers all of the time. Only a haircare specialist can be sure your hair is strong enough and prepared for a chemical application.