Here's what rhymes with reactogenic.
antigenic pyogenic pathogenic splenic biogenic cryogenic eugenic phrenic androgenic allergenic photogenic irenic telegenic transgenic iatrogenic mutagenic neurogenic teratogenic hypoallergenic anthropogenic psychogenic calisthenic schizophrenic carcinogenic neurasthenic callisthenic hallucinogenic Words that almost rhyme with reactogenic
academic epidemic polemic pandemic totemic pfennig endemic systemic epistemic ischemic leukaemic nonacademic technic benthic derrick genetic poetic authentic generic acetic diabetic pathetic pelvic angelic ascetic ferric relic peptic allelic eutectic steric dietetic geodesic geodetic medic fetich pectic domestic energetic kinetic prophetic athletic majestic metric esoteric forensic phonetic septic alphabetic apathetic aseptic centric cleric enteric hectic emetic sceptic tartaric turmeric hermetic acerbic antithetic lovesick paregoric bathetic magnetic aesthetic dialectic geometric symmetric antiseptic apologetic cosmetic epileptic esthetic numeric diuretic obstetric prosthetic empathetic frenetic isomeric psychedelic skeptic apoplectic chimeric dyspeptic hysteric evangelic paramedic paraplegic polytechnic pyrotechnic diametric gametic parenthetic redbrick unauthentic exegetic copacetic electric sympathetic atmospheric synthetic anesthetic dielectric eccentric asymmetric concentric eclectic mesenteric parametric anaesthetic isometric barometric cybernetic kinesthetic monomeric photometric anorexic dyslexic geocentric inauthentic peripatetic anorectic antipathetic cataleptic homiletic splenetic unaesthetic unapologetic phrenetic dyslectic arithmetic econometric phylogenetic antidiuretic egocentric geomagnetic ontogenetic alphanumeric ionospheric thermometric narcoleptic telekinetic nonathletic psychokinetic unesthetic cliometric volumetric psychometric unsympathetic biosynthetic colorimetric ethnocentric neuroleptic paramagnetic trigonometric anthropocentric heliocentric radiometric nonmagnetic onomatopoetic nonelectric parasympathetic photoelectric photosynthetic ferromagnetic isoelectric nonparametric pharmacokinetic piezoelectric stoichiometric electromagnetic hydroelectric