The phrase "are not efficacious" is correct and usable in written English.
It can be used when discussing the effectiveness or ability of something to produce a desired result, often in a formal or academic context.
Example: "The treatments administered in the study are not efficacious in reducing the symptoms of the disease."
Alternatives: "are ineffective" or "do not work".
Glucocorticosteroids are not efficacious.
Similarly, calcium channel blockers can reduce contraction amplitude in normal subjects and patients with high-amplitude contractions, but these agents are not efficacious in relieving symptoms and produced significant side effects in the controlled clinical trials.141, 142 Therefore, it is clear that therapies other than smooth muscle relaxants are required in the treatment of esophageal pain.
The treatment of migraine attacks with aura by triptans is difficult since triptans most probably are not efficacious when taken during the aura phase.
Segal (2009) argues that being a belief and being a desire are dispositional properties, and that dispositional properties are not efficacious.
Prevention strategies using tamoxifen are not efficacious for these tumors.
As mentioned, resident microglial cells surrounding Aβ plaques are not efficacious in degrading Aβ.
A recombinant glycoprotein D vaccine yielded a 38 42% efficacy in HSV1 seronegative women, yet was not efficacious at all in men and in HSV1 seropositive women (Stanberry et al., 2002).
Sham surgeries are difficult to justify ethically, yet they have been successful in showing that accepted surgical procedures were not efficacious.
Medical therapy although useful in reducing the severity of other symptoms of endometriosis such as pain and menstrual disorders, is not efficacious to improve fertility.
However, this is not efficacious in all HR-MDS-MSCs; samples HR261 and HR325, which were obtained from patients in < 1 year before disease transformation leading to death were only partially responsive to AZA therapy.
Posterolateral visualization directly with the camera and via the anterolateral portal is efficient and associated with minimal morbidity but was not efficacious in the cohort evaluated.Level of Evidence:Level II.
