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Systematic (IUPAC) name
4-cyano-4-(3-cyclopentyloxy-4-methoxyphenyl)cyclohexane-1-carboxylic acid
CAS number  ?
ATC code none
PubChem 151170
Chemical data
Formula C 20H25NO4  
Mol. mass 343.417 g/mol
SMILES eMolecules & PubChem
Pharmacokinetic data
Bioavailability  ?
Metabolism  ?
Half life  ?
Excretion  ?
Therapeutic considerations
Pregnancy cat.  ?
Legal status
Routes  ?

Cilomilast (Ariflo, SB-207,499) is a drug which was developed for the treatment of respiratory disorders such as asthma and Chronic Obstructive Pulmonary Disease (COPD). It is orally active and acts as a selective Phosphodiesterase-4 inhibitor.[1]

Phosphodiesterase (PDE) inhibitors, such as theophylline, have been used to treat Chronic Obstructive Pulmonary Disease (COPD) for centuries; however, the clinical benefits of these agents have never been shown to out-weigh the risks of their numerous adverse effects. Four clinical trials were identified evaluating the efficacy of cilomilast, the usual randomized, double-blind, and placebo-controlled protocols were used. It showed reasonable efficacy for treating COPD, but side effects were problematic and it is unclear whether cilomalast will be marketed, or merely used in the development of newer drugs.[2][3]

Cilomilast is a second-generation PDE4 inhibitor with antiinflammatory effects that target bronchoconstriction, mucus hypersecretion, and airway remodeling associated with COPD.


  1. ^
  2. ^ Torphy TJ, Barnette MS, Underwood DC, Griswold DE, Christensen SB, Murdoch RD, Nieman RB, Compton CH. Ariflo (SB 207499), a second generation phosphodiesterase 4 inhibitor for the treatment of asthma and COPD: from concept to clinic. Pulmonary Pharmacology and Therapeutics. 1999;12(2):131-5. PMID 10373396
  3. ^ Ochiai H, Ohtani T, Ishida A, Kusumi K, Kato M, Kohno H, Kishikawa K, Obata T, Nakai H, Toda M. Highly potent PDE4 inhibitors with therapeutic potential. Bioorganic and Medicinal Chemistry Letters. 2004 Jan 5;14(1):207-10. PMID 14684329


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