GSK-2269557 (nemiralisib), a PI3Kδ inhibitor, is in development as an anti-inflammatory drug for the treatment of inflammatory airways disease. Studies in moderate or severe stable COPD patients have shown an acceptable safety and tolerability profile when GSK-2269557 was administered via inhalation. Cough was the most commonly reported adverse event.

Cevipabulin is a synthetic, water-soluble tubulin-binding agent with potential antineoplastic activity. Cevipabulin appears to bind at the vinca-binding site on tubulin but seems to act more similar to taxane-site binding agents in that it enhances tubulin polymerization and does not induce tubulin depolymerization. The disruption in microtubule dynamics may eventually inhibit cell division and reduce cellular growth.

Tazadolene was developed as a novel non-opioid analgesic with antidepressant properties. Experiments on rodents have revealed that unique analgesia properties of tazadolene was due to the ability of this compound to activate both serotonergic and alpha 2 adrenergic antinociceptive systems. Information about the current use of this drug is not available.