È ricordato per un noto trattato di farmacologia ("Gaddum's Pharmacology") edito dalla Oxford university press in numerose edizioni[1], e pubblicato anche in edizione italiana dall'editore Piccin di Padova.
Fra i numerosi lavori, si elencano qui alcuni il cui testo elettronico può essere scaricato integralmente e gratuitamente ("Full text free"):
Gaddum JH, Hameed KA, Hathway DE, Stephens FF, Quantitative studies of antagonists for 5-hydroxytryptamine, in Q J Exp Physiol Cogn Med Sci sciences, vol.40, n.1, 1955 Jan, pp.49-74, PMID14371990.
Amin AH, Crawford TB, Gaddum JH, The distribution of substance P and 5-hydroxytryptamine in the central nervous system of the dog, in J Physiol, vol.126, n.3, 1954 Dec 10, pp.596-618, PMID13222357.
Gaddum JH, Clinical pharmacology, in Proc R Soc Med, vol.47, n.3, 1954 Mar, pp.195-204, PMID13155508.
Gaddum JH, Tryptamine receptors, in J Physiol, vol.119, n.2-3, 1953 Feb 27, pp.363-8, PMID13035757.
Gaddum JH, Hebb CO, Silver A, Swan AA, 5-Hydroxytryptamine; pharmacological action and destruction in perfused lungs, in Q J Exp Physiol Cogn Med Sci sciences, vol.38, n.4, 1953, pp.255-62, PMID13155768.
Gaddum JH, The metabolism of histamine, in Br Med J, vol.2, n.4738, 1951 Oct 27, pp.987-91, PMID14869789.
Gaddum JH, Peart WS, Vogt M, The estimation of adrenaline and allied substances in blood, in J Physiol, vol.108, n.4, 1949 Jun 15, pp.467-81, PMID16991878.
Gaddum JH, Goodwin LG, Experiments on liver sympathin, in J Physiol, vol.105, n.4, 1947 Jan 15, pp.357-69, PMID16991732.
Gaddum JH, A method of recording the respiration, in J Physiol, vol.99, n.2, 1941 Jan 14, pp.257-64, PMID16995249.
Gaddum JH, Kwiatkowski H, Properties of the substance liberated by adrenergic nerves in the rabbit's ear, in J Physiol, vol.96, n.4, 1939 Sep 14, pp.385-91, PMID16995140.
Gaddum JH, Jang CS, Kwiatkowski H, The effect on the intestine of the substance liberated by adrenergic nerves in a rabbit's ear, in J Physiol, vol.96, n.1, 1939 Jun 14, pp.104-8, PMID16995111.
Gaddum JH, Kwiatkowski H, The action of ephedrine, in J Physiol, vol.94, n.1, 1938 Oct 14, pp.87-100, PMID16995037.
Barsoum GS, Gaddum JH, The pharmacological estimation of adenosine and histamine in blood, in J Physiol, vol.85, n.1, 1935 Aug 22, pp.1-14, PMID16994692.
Gaddum JH, Schild H, Depressor substances in extracts of intestine, in J Physiol, vol.83, n.1, 1934 Dec 14, pp.1-14, PMID16994608.
Feldberg W, Gaddum JH, The chemical transmitter at synapses in a sympathetic ganglion, in J Physiol, vol.81, n.3, 1934 Jun 9, pp.305-19, PMID16994545.
Chang HC, Gaddum JH, Choline esters in tissue extracts, in J Physiol, vol.79, n.3, 1933 Oct 6, pp.255-85, PMID16994462.
Gaddum JH, Holtz P, The localization of the action of drugs on the pulmonary vessels of dogs and cats, in J Physiol, vol.77, n.2, 1933 Jan 16, pp.139-58, PMID16994379.
von Euler US, Gaddum JH, Pseudomotor contractures after degeneration of the facial nerve, in J Physiol, vol.73, n.1, 1931 Sep 18, pp.54-66, PMID16994228.
von Euler US, Gaddum JH, An unidentified depressor substance in certain tissue extracts, in J Physiol, vol.72, n.1, 1931 Jun 6, pp.74-87, PMID16994201.
Dale HH, Gaddum JH, Reactions of denervated voluntary muscle, and their bearing on the mode of action of parasympathetic and related nerves, in J Physiol, vol.70, n.2, 1930 Sep 18, pp.109-44, PMID16994129.
Gaddum JH, The action of adrenalin and ergotamine on the uterus of the rabbit, in J Physiol, vol.61, n.1, 1926 Mar 18, pp.141-50, PMID16993772.
Gaddum JH, Quantitative observations on thyroxine and allied substances: I. The use of tadpoles, in J Physiol, vol.64, n.3, 1927 Dec 29, pp.246-54, PMID16993917.
Gaddum JH, Some properties of the separated active principles of the pituitary (posterior lobe), in J Physiol, vol.65, n.4, 1928 Aug 14, pp.434-40, PMID16993964.