Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
fully efficacious
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "fully efficacious" is correct and usable in written English.
It can be used in contexts where you want to describe something that is completely effective or capable of producing the desired result. Example: "The new vaccine has been shown to be fully efficacious in preventing the disease in clinical trials."
✓ Grammatically correct
Science
News & Media
Alternative expressions(3)
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
8 human-written examples
Compound 9 (1 mg/kg, ip) was fully efficacious in reverting scopolamine-induced amnesia in mice.
At higher, fully efficacious doses, the side effect profiles could not be differentiated between the two drugs.
Science
Hepatitis C virus (HCV) infection is a major cause of chronic liver disease and hepatocellular carcinoma, yet fully efficacious treatments are missing.
Science
This preliminary study demonstrates the incorporation of chlamydospores of nematophagous fungus, as A flagrans appears highly promising for reduction of the infective stages of the strongyles affecting captive animals, but the experimental design precludes true determination of whether the treatment is fully efficacious.
Despite that the peptides were weakly potent as shown by their sub-micromolar EC50 values, their abilities to stimulate in a concentration-dependent manner cAMP response showed that they were fully efficacious agonists of this receptors.
Science
51, 52, 68, 69 The overall results from the dose selection analyses suggested that the lowest lasofoxifene dose necessary to achieve a fully efficacious response on BMD and low-density lipoprotein cholesterol (LDL-C) levels is 0.25 mg/day.
Human-verified similar examples from authoritative sources
Similar Expressions
52 human-written examples
Third party donor-derived CTLs might be expected to be less efficacious than fully HLA-matched CTLs, but the outcomes from this bank, as well as other centres (Doubrovina et al, 2012), have reported broadly similar outcomes to the use of autologous cells.
The mechanisms of phosgene-induced pulmonary injury are not fully identified, and currently there is no efficacious countermeasure.
Science
I often tell my patients that it is quite impossible for them to fully recover, and that they should expect less efficacious treatment to avoid disappointment since there are still many limitations in the current treatment for their bladder condition.
Science
The neutral NPs are efficacious at the proximal LN, while the fully charged NPs have no effect on either LNs.
Fully covered Self-Expanding metal stents (FCSEMS) have been shown efficacious in palliating malignant biliary obstructions.
Science
Expert writing Tips
Best practice
When describing treatments or interventions, use "fully efficacious" to clearly communicate that the desired outcome is consistently and completely achieved. For example, "The new drug is considered "fully efficacious" in treating the infection".
Common error
Avoid using "fully efficacious" when the evidence only shows partial or inconsistent results. Overstating the effectiveness can mislead readers and undermine the credibility of your claims.
Source & Trust
82%
Authority and reliability
4.1/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "fully efficacious" functions as an adjective phrase modifying a noun. It serves to describe something as being completely effective. As shown in Ludwig examples, it commonly describes treatments, drugs, or interventions.
Frequent in
Science
75%
News & Media
25%
Formal & Business
0%
Less common in
Academia
0%
Encyclopedias
0%
Wiki
0%
Ludwig's WRAP-UP
In summary, "fully efficacious" is an adjective phrase denoting complete effectiveness, commonly found in scientific and medical contexts. Ludwig AI confirms its grammatical correctness. While less frequent than simpler alternatives, it provides a clear and emphatic way to describe the extent of efficacy. As shown by Ludwig, its use is appropriate when communicating the thorough success of a treatment or intervention. Consider simpler terms in less formal contexts.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
fully effective
Removes redundancy by omitting "efficacious", retaining the core meaning.
completely effective
Replaces "efficacious" with a more common synonym and emphasizes the completeness of the effect.
entirely effective
Similar to "completely effective" but uses "entirely" to highlight the total effectiveness.
totally effective
Emphasizes the complete effectiveness with "totally".
wholly effective
Uses "wholly" to stress that the effect is entirely without limitations.
absolutely effective
Uses "absolutely" to underscore the certainty and completeness of the effectiveness.
perfectly effective
Highlights that the effectiveness is flawless and ideal.
completely successful
Shifts the focus to the success of the outcome while retaining the meaning of full effectiveness.
unqualifiedly effective
Emphasizes that the effectiveness is without any qualification or reservation.
efficacious in full
Reorders the phrase slightly to emphasize the state of being 'in full' efficacy.
FAQs
How can I use "fully efficacious" in a sentence?
Use "fully efficacious" to describe something that is completely effective or capable of producing the desired result. For example: "The treatment proved "fully efficacious" in clinical trials."
What are some alternatives to "fully efficacious"?
You can use alternatives like "completely effective", "entirely successful", or "wholly effective" depending on the context.
Is "fully efficacious" formal or informal?
"Fully efficacious" is generally considered a formal term, suitable for scientific, medical, or technical contexts. In more casual settings, simpler alternatives like "completely effective" may be preferred.
What does "fully efficacious" mean?
"Fully efficacious" means completely effective; producing the desired result to the greatest extent possible.
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
82%
Authority and reliability
4.1/5
Expert rating
Real-world application tested