Group 3 PH patients also had higher rates of pharmacy claims for PAH-related drugs—prostacyclin analogues, ERAs, and/or PDE5 inhibitors—than controls in both the baseline (16.4% in Group 3 PH patients vs. 1.5% in controls) and follow-up periods (22.1 vs. 1.8%) (Table 2). Here, PDE5A is linked to pulmonary arterial hypertension.