sildenafil citrate vs Viagra

sildenafil citrate and Viagra both are nouns.

Word	Noun	Adjective	Verb	Adverb
sildenafil citrate	Yes	No	No	No
Viagra	Yes	No	No	No

As nouns, sildenafil citrate and Viagra are synonyms defined as:

sildenafil citrate and Viagra: virility drug (trade name Viagra) used to treat erectile dysfunction in men

Other synonyms of sildenafil citrate include sildenafil.

sildenafil citrate (noun)	Viagra (noun)
virility drug (trade name Viagra) used to treat erectile dysfunction in men	virility drug (trade name Viagra) used to treat erectile dysfunction in men