In animal and human studies, it has shown similar efficacy to theophylline but with significantly fewer side effects.

Tibolone has similar or greater efficacy compared to older hormone replacement drugs, but shares a similar side effect profile.

Benzodiazepines and nonbenzodiazepines have similar efficacy that is not significantly more than for antidepressants.

It has similar efficacies at both D and D sites.

A second vaccine targeting HPV16 and 18 has had similar efficacy.

Care must be taken in identifying drugs that may be safely split while still delivering half the dose with the same or similar efficacy.

The combination group experienced similar efficacy, but with increased risk of hypotensive symptoms.

It is administered as a nasal spray or injection and has an efficacy similar to that of sumatriptan.

It has been investigated for the treatment of alcoholism and cocaine addiction, showing similar efficacy to naltrexone but possibly with reduced side effects.

St John's wort had similar efficacy to standard antidepressants.