Is therapeutic substitution safe?

Therapeutic substitution should always be done with your prescriber's guidance. Many drug classes have multiple effective options, and your doctor can often prescribe a less expensive alternative with equivalent clinical outcomes.

Therapeutic Substitution

Q: What is therapeutic substitution?

Therapeutic substitution is switching from one medication to a different drug in the same therapeutic class. Unlike generic substitution (same molecule, different brand), therapeutic substitution uses a different active ingredient that works similarly. Examples: switching from Crestor (rosuvastatin) to Lipitor generic (atorvastatin) in the statin class.

How to work with your doctor to find a clinically equivalent drug at a fraction of the cost.

What is therapeutic substitution?

Therapeutic substitution switches you from one medication to a different but clinically equivalent drug in the same class. Unlike generics (same molecule), therapeutic substitution uses a different active ingredient with similar effectiveness. Always done with prescriber guidance — not a pharmacist decision.

Common therapeutic substitution examples

Expensive drug	Alternative	Drug class
Crestor (rosuvastatin)	Generic atorvastatin	Statins
Lexapro (escitalopram)	Generic sertraline	SSRIs
Nexium (esomeprazole)	Generic omeprazole	PPIs
Singulair (montelukast)	Generic montelukast	Leukotriene antagonists
Benicar (olmesartan)	Generic losartan	ARBs

Once your prescriber writes a new Rx, compare prices across pharmacies on Script Unlock.

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