Ultrasonic Mixing Technology for Pharmacies

Sonicators are high-energy homogenizers that have their fixed place in compounding pharmacies and apothecaries. Ultrasonic homogenization is based on acoustic cavitation that generates intense localized shear forces, promoting particle-size reduction, deagglomeration, emulsification, and uniform dispersion of active pharmaceutical ingredients and excipients. This technology empowers pharmacists to produce superior-quality custom medications characterized by exceptional smoothness, enhanced bioavailability, and rigorous batch-to-batch consistency, ultimately elevating the standard of care for patients relying on complex, specialized therapies.

The Benefits of Ultrasonic Homogenization of Customized Drugs and Therapeutics

Unmatched Mixing Homogeneity
Uniform Distribution: Ultrasonic waves create intense micro-turbulence (acoustic streaming) that distributes active pharmaceutical ingredients (APIs) evenly throughout the base, even in high-viscosity compounds.
Dosage Accuracy: Eliminates “hot spots” or uneven concentrations, ensuring every dose administered to the patient contains the precise amount of medication.
Handling Potent Drugs: Ideal for mixing potent hormones or custom medications where even a microscopic variance in distribution could impact efficacy.
Enhanced Formulation Quality & Stability
Superior Emulsification: Creates stable, fine emulsions (oil-in-water or water-in-oil) that resist separation. This extends shelf life and prevents the “oily” or “watery” separation common in manual mixing.
Particle Size Reduction (Micronization): Breaks down agglomerates and reduces particle size. This is critical for topical compounds to eliminate “grittiness,” making the product smoother and more cosmetically elegant.
Improved Solubility: Helps dissolve poorly soluble drugs or natural supplements (like CBD or turmeric) more effectively than mechanical stirring.
Workflow Efficiency & Time Savings
Rapid Processing: Significantly reduces mixing times. What might take hours of manual stirring or high-shear blending can often be achieved in minutes.
Reduced Labor Intensity: Automates the most tedious part of compounding, allowing pharmacists and technicians to focus on verification and patient consultation.
Scalability: Whether you are compounding a single prescription or a larger batch, sonicators – using probe and/or flow-cell – maintain efficiency across different volumes.
Patient Comfort & Clinical Outcomes
Better Absorption (Bioavailability): By reducing particle size and ensuring a uniform dispersion, sonication can enhance the skin’s or gut’s ability to absorb the active ingredients.
Improved Patient Compliance: Smoother, non-gritty creams and lotions are more comfortable for patients to apply, encouraging consistent use of the prescribed medication.
Preservation of Active Ingredients: Unlike high-heat mechanical blending, sonication can be controlled to minimize thermal degradation of heat-sensitive compounds (like peptides or certain vitamins).
Quality Control & Consistency
Batch-to-Batch Reproducibility: Digital controls allow for precise setting of amplitude and time, ensuring continuously high quality standards.
Versatility: Can handle a wide range of bases, from tinctures, suspensions, gels and lotions to thick ointments and suppositories, without the need to switch mixing equipment.

Consistent Formulations, Every Batch!
Tell us about your most challenging drug compounding formulations. Our expert team will recommend you a sonicator setup that ensures homogeneity, potency accuracy, and reproducible compounding.

Pharmacists have to blend, mix, emulsify and disperse homogeneous formulations on a daily basis to prepare compounded drugs and customized lotions. Compounding is the mixing of drugs by a skilled pharmacist and requires a suitable homogenization technology. Ultrasound is very effective when it comes to the preparation of uniform, fine-size suspensions, emulsions or dispersions.
Whether you need to formulate a customized lotion or tincture, to disperse solids homogeneously in a liquid, or to emulsify oil or fat in a water-based liquid, our ultrasonic homogenizers are the ideal tool for high quality pharmaceutical products.

Suitable for:

emulsions
dispersions
solutions
suspensions
mixtures
foams and mousses
liposomes
active pharmaceutical ingredients (APIs)

In this video we make a nano-emulsion of CBD rich hemp oil in water using a Hielscher UP400St ultrasonicator. We then measure the nano-emulsion using a NANO-flex DLS. The measurement results show a very narrow, volume-weighed particle size distribution in the range from 9 to 40 nanometers. 95 percent of all particles are below 28 nanometers.

Gentle or high intense homogenization with the same device

Ultrasound can be very soft and gentle or very intense. You can adjust the power input of Hielscher’s lab ultrasonicators by setting the ultrasonic power between 20% and 100% depending on your formulation and process goal. Further, you can choose from a variety of sonotrodes (also known as ultrasonic horn/ probe) that is suitable for the volume to be processed. One device gives you the freedom for manifold applications!
Using ultrasonics for the compounding of medication and for the preparation of ointments and cremes as well as for dissolving of powders or tablets saves you a lot of time. Ultrasonic homogenization is an easy, efficient and fast technique for your pharmaceutical lab.

Advantages at a glance:

fast
safe
reproducible results
High hygienic standard: autoclavable probes, no hidden orifices
Easy operation
CIP: Clean-In-Place
Safety: no moving parts (no rotating blades)

Choose the suitable device:

Device	Power [Watts]	Type	Volume [mL]
UP50H	50 W	handheld or standmounted	0.01	–	250 mL
UP100H	100 W	handheld or standmounted	0.01	–	500 mL
UP200Ht	200 W	handheld or standmounted	0.1	–	1000 mL
UP200St	200 W	standmounted	0.1	–	1000 mL
UP400St	400 W	standmounted	5.0	–	2000 mL

Frequently Asked Questions: Ultrasonic Homogenization in Compounding

How does a probe-type sonicator work as a homogenizer?

A probe-type sonicator works by converting electrical energy into high-frequency sound waves (ultrasound) via a titanium probe (horn). When the probe is inserted into a liquid, it creates “acoustic cavitation.” This process generates microscopic bubbles that rapidly expand and collapse with immense energy, creating high-shear forces. These forces break down particles, disperse powders, and mix immiscible liquids, resulting in a perfectly homogenized compound in a fraction of the time required by traditional stirrers.

Why is sonication better than traditional mechanical mixing for compounded creams?

Traditional mechanical mixing often leaves “hot spots” or uneven concentrations and struggles to break down agglomerates in thick bases. Sonication provides high-energy dispersion that reduces particle size (micronization) and ensures a uniform distribution of Active Pharmaceutical Ingredients (APIs). This results in a smoother, more cosmetically elegant cream that is less gritty, has a longer shelf life, and offers better bioavailability for the patient.

Is sonication effective for CBD and hemp oil formulations?

Yes, sonication is widely regarded as the gold standard for CBD compounding. Because CBD is lipophilic (fat-soluble) and often comes in a thick oil, it can be difficult to emulsify into water-based lotions. The high shear force of a probe sonicator breaks the oil into microscopic droplets, creating a stable, non-separating emulsion. This also helps increase the bioavailability of the CBD, making the product more effective for the patient.

How is temperature controlled during sonication to protect heat-sensitive drugs?

While the sonication process generates some heat due to energy transfer, modern probe systems offer precise controls to prevent thermal degradation.

Integrated Temperature Control: Hielscher digital sonicators come with a pluggable temperature sensor and allow to set temperature limits. When the sonicated drug formulation reaches the temperature limit, the sonicator automatically stops the sonication process and continues automatically when the formulation is in the allowed temperature range again.

Pulse Mode: The sonicator can be set to “pulse” (e.g., 5 seconds on, 5 seconds off) to allow the solution to cool between bursts.

Ice Baths: The vessel containing the compound can be placed in an ice bath during the process.
Amplitude Control: Lowering the amplitude reduces heat generation.

This ensures that sensitive ingredients like peptides, vitamins, and hormones remain stable during mixing.

How do I ensure the sonication process meets USP 795 and 797 standards?

Sonication is fully compatible with USP standards when proper protocols are followed. The titanium probe can be easily cleaned or sterilized between uses. To ensure aseptic technique (USP 797), many pharmacists use the VialTweeter Multi-Tube Sonicator for sterile compounding. Additionally, the closed-vessel mixing method prevents contamination from the environment.

What types of medications benefit most from ultrasonic homogenization?

Ultrasonic mixing is versatile and benefits a wide range of compounded formulations, including:

Topicals: Creams, ointments, and transdermal gels (improves texture and absorption).
Suspensions: Mixing insoluble powders into liquid bases.
Emulsions: Creating stable lotions that don’t separate (e.g., CBD, melatonin, hormone creams).
Suppositories: Ensuring the active ingredient is evenly distributed within the suppository base for accurate dosing.

Can a probe sonicator handle high-viscosity compounds?

Yes. Unlike bath sonicators, which are limited to lower viscosities, probe-type sonicators can penetrate thick, high-viscosity compounds. The energy transfer is direct and intense, allowing the device to effectively mix heavy ointments and thick gels that would stall or overheat a standard overhead stirrer.