
In California, pharmacists are permitted to make certain modifications to prescriptions under specific circumstances. While they cannot alter the dosage without consulting the prescribing doctor, they may make changes to the form, taste, or administration method of a medication to facilitate ease of consumption. This process, known as pharmaceutical compounding, can involve converting medications between liquid and tablet forms, adding flavouring, or removing inactive ingredients. Additionally, pharmacists can perform therapeutic substitutions, replacing a prescribed drug with another from the same class, and generic substitutions, offering cheaper alternatives to brand-name medications. However, certain medications, such as antidepressants, cardiovascular drugs, and epileptic medications, are not suitable for therapeutic substitution due to the precise dosage requirements. In California, pharmacists are also authorised to refill prescriptions without prescriber authorisation in cases where the patient's ongoing care may be interrupted, and they are required to provide the current retail price of drugs upon consumer request.
| Characteristics | Values |
|---|---|
| Can a pharmacist change the prescription? | Yes, a pharmacist may change the prescription in some cases. For instance, they may substitute medications without notifying beforehand. However, the doctor can specify on the prescription that it should be "dispensed as written" and may not be substituted. |
| Can a pharmacist change the strength of a prescription? | Yes, a pharmacist may change the strength or dosage of a prescription. This is known as pharmaceutical compounding, which is a way of customising a patient's prescription to fit their unique needs. |
| Can a pharmacist refuse to fill a prescription? | Yes, a pharmacist may refuse to fill a prescription based on their professional judgment. |
| Are there any consultation requirements? | Yes, the pharmacist is required to counsel patients regarding their prescription medication before dispensing. |
| Are there any requirements for prescription labels? | Yes, California law requires four elements on the label to be in 12-point san serif font and occupy at least 50% of the label. These elements include the name of the drug, its strength, the name of the patient, and the condition or purpose for which the drug is being prescribed. |
| Are there any staffing requirements? | Yes, California law requires chain community pharmacies to be staffed with at least one clerk or pharmacy technician dedicated to performing pharmacy services during regular business hours. |
| Are there any requirements for medication error reporting? | Yes, California law requires store management to take reasonable steps to resolve medication errors within 24 hours before the pharmacist notifies the Board of Pharmacy. |
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What You'll Learn

Therapeutic substitution
In the United States, therapeutic substitution refers to the practice of switching a person's prescription medication to a chemically different drug with different active ingredients. This is different from generic substitution, where a brand-name drug is switched to its generic equivalent with the same active ingredients. Therapeutic substitution is often promoted as a cost-saving strategy for insurers. However, it is important to note that therapeutic substitution can pose serious risks, especially for individuals taking mental health medications.
In the context of California law, while I couldn't find specific information on whether pharmacists can change the strength of a prescription, therapeutic substitution is a relevant concept. In California, as in other states, health insurers may request or require therapeutic substitution, replacing a prescribed medication with a chemically different drug. This can be concerning, especially for individuals with mental health conditions, as mental health medications can have varying levels of effectiveness and side effects for different people.
To address this issue, some public policy organizations, such as NAMI (National Alliance on Mental Illness), advocate for policies that prohibit the therapeutic substitution of psychiatric medications. NAMI emphasizes the importance of individuals having access to the medication that best meets their unique health needs. They suggest that prescribers should have the option to exempt a prescription from therapeutic substitution by indicating "dispense as written" or "no substitutions."
To ensure that you receive the medication your doctor has prescribed, there are several steps you can take:
- Request your doctor to mark your prescriptions with "medically necessary," "may not substitute," or "dispense as written (DAW)."
- Instruct your pharmacist to add a statement to your records, specifying that you do not authorize any substitutions without your approval and that of your doctor.
- Regularly communicate with your doctor and pharmacist to ensure that you are aware of any changes to your medication and that they align with your treatment plan.
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Generic substitution
In the United States, all states have laws that address generic substitution to varying degrees. There are positive formulary states, which identify generics that can be substituted, and negative formulary states, which list drugs that cannot be substituted. Some states, like Oklahoma, have laws that prohibit pharmacists from substituting any like drugs without the authority of the prescriber or purchaser. In Hawaii, pharmacists are not allowed to substitute an equivalent generic product for any antiepileptic drug without the consent of both the practitioner and the patient. In California, a law was passed in October 2017 that banned the use of co-payment coupons for brand-name drugs with direct generic competitors, with the aim of promoting the use of cost-saving generics. This law came into effect in January 2018, and while it did not significantly increase generic substitution in its first year, it is possible that its effects may have increased over time.
According to California Business and Professions Code § 4073, a pharmacist filling a prescription for a drug product prescribed by its brand name may select another drug product with the same active chemical ingredients, strength, quantity, dosage form, and generic drug name. The United States Adopted Names (USAN) and the federal Food and Drug Administration (FDA) determine the generic drug name. However, if the prescriber indicates "Do not substitute" or similar words, either orally or in writing, the pharmacist must not select a different drug product. Additionally, the pharmacist assumes responsibility for selecting the dispensed drug product and must ensure that the selected product costs the patient less than the prescribed drug.
In certain situations, a pharmacist in California may furnish a dangerous drug or device without a prescription during emergencies to protect public health and safety. For example, during a federal, state, or local emergency, the board may waive certain provisions to aid in public health or patient care. Similarly, a prescription for a dangerous drug or device may be refilled without the prescriber's authorization if the pharmacist deems it necessary to prevent interrupting the patient's ongoing care and avoiding adverse effects on their well-being. In such cases, the pharmacist must inform both the patient and the prescriber about the refill and make reasonable efforts to contact the prescriber beforehand.
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Pharmaceutical compounding
In California, the law allows pharmacists, in good faith, to provide dangerous drugs or devices in quantities deemed reasonable without a prescription during a federal, state, or local emergency. This is done to further the health and safety of the public. However, pharmacists must maintain a record of the date, name, and address of the individual receiving the drug or device, along with the name, strength, and quantity of the furnished item. This record-keeping is essential to ensure accountability and proper monitoring of drug distribution.
Now, regarding pharmaceutical compounding, the California State Board of Pharmacy oversees this practice and has established specific regulations. Pharmaceutical compounding involves the preparation of customized medications to meet the unique needs of patients. It is a specialized process where pharmacists combine, mix, or alter ingredients to create a specific formulation. This practice is particularly useful when a patient requires a medication that is not commercially available, or when a specific dosage form or strength is needed.
In California, pharmacies that engage in sterile compounding must adhere to stringent licensing requirements. The board conducts thorough inspections to ensure compliance with all relevant laws and regulations before issuing or renewing a sterile compounding license. Article 7.5 of the Business and Professions Code, starting with Section 4127, outlines the requirements that sterile compounding pharmacies must meet. Additionally, the California Code of Regulations includes further specifications for compounding practices to ensure safety and efficacy.
It is important to note that nonresident pharmacies that ship compounded sterile drug products into California are subject to additional requirements. These pharmacies must reimburse the board for the cost of inspection before obtaining a license. By enforcing these regulations, the California State Board of Pharmacy maintains high standards for compounded medications, safeguarding the health and well-being of patients who rely on these specialized pharmaceutical preparations.
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Doctor's approval
In California, pharmacists are required to counsel patients regarding their prescription medication before dispensing it. This consultation provides the pharmacist with the opportunity to educate patients about new prescriptions and protect them from potential problems associated with a new medication by discussing possible side effects, contraindications, and the importance of following directions.
Pharmacists in California are also allowed to substitute medications without notifying patients beforehand. However, if a patient does not want their medication to be substituted, they can ask their doctor to note this on the prescription by writing "DAW" (dispense as written), "medically necessary," or "may not substitute."
While pharmacists in California have some flexibility in substituting medications, they may still need a doctor's approval for certain changes, such as therapeutic substitution. The requirement for doctor's approval depends on the specific drug, the type of switch occurring, and state laws.
In addition to this, California law grants pharmacists the authority to refuse to fill a prescription if they deem it necessary. They are not mandated by law to take back prescriptions that have been dispensed. Furthermore, California laws and regulations are constantly evolving to give pharmacists more power and responsibilities, such as the ability to administer certain vaccines and prepare and administer epinephrine.
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Emergency prescription
In California, a pharmacist may, in good faith, dispense a dangerous drug or device in reasonable quantities without a prescription during a federal, state, or local emergency. This is to further the health and safety of the public. The pharmacist must keep a record of the date, name, and address of the person to whom the drug or device is dispensed, as well as the name, strength, and quantity of the drug or device. This is outlined in the California Business and Professions Code 4050-4068.
The Board of Pharmacy has issued guidance on dispensing without a prescription, acknowledging that during emergencies, patients may not be able to produce prescription documents and that it may be impossible to contact a prescriber. To prevent the loss of life, intense suffering, or interruption in therapy, pharmacists are advised to use their professional judgment to provide a reasonable quantity of medications.
In addition to the above, under California law, pharmacies may refill prescriptions without prescriber authorization if the prescriber is unavailable and, in the pharmacist's judgment, failing to refill the prescription might interrupt the patient's ongoing care and have a significant adverse effect on the patient's well-being. In such cases, the pharmacist must inform the patient that the prescription was refilled under emergency-fill regulations and must also inform the prescriber within a reasonable period of time. Reasonable efforts must be made to contact the prescriber, and these attempts must be documented.
It is important to note that California's laws regarding emergency prescriptions are distinct from its electronic prescription laws, such as AB 852, which outlines requirements for electronic data transmission prescriptions and provides exemptions for certain prescribers and pharmacies.
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Frequently asked questions
A pharmacist in California can change a prescription in the following ways:
- Therapeutic substitution: Switching out a prescribed drug with another drug in the same class.
- Generic substitution: Giving out a cheaper generic version of a brand-name drug.
- Pharmaceutical compounding: Changing the form or taste of the drug to make it easier for the patient to take.
Yes, it is important to inform your pharmacist of all drugs and supplements you are taking. This is because your pharmacist can then identify any potential drug or supplement interactions that your doctor may have missed.
A pharmacist cannot change the dosage of your prescription without talking to your doctor and getting their approval. However, they can decide how best to dispense medications. For example, if your doctor prescribes 50mg of a drug to be taken daily, your pharmacist could give you 25mg tablets and instruct you to take two daily.
Yes, pharmacists may substitute medications without notifying you beforehand. If you do not want your medication to be substituted, ask your doctor to note this on your prescription.
This depends on the state you live in. In some states, a pharmacist can change a prescription in certain ways. If you are in California, see the first answer.








































