Table 2. Risk factors for and associated conditions of pulmonary arterial hypertension.

Definite	Possible
Aminorex	Cocaine
Fenfluramine	Phenylpropanolamine
Dexfenfluramine	St John's Wort
Toxic rapeseed oil	Chemotherapeutic agents
Benfluorex	Selective serotonin reuptake inhibitors
Dasatinib	Pergolide
Likely	Unlikely
Amphetamines	Oral contraceptives
L-Tryptophan	Oestrogen
Methamphetamines	Cigarette smoking

Reproduced and modified from [5].