Ritodrine

Ritodrine

Ritodrine
Systematic (IUPAC) name
4-(2-((1R,2S)-1-hydroxy-1-(4-hydroxyphenyl)propan-2-ylamino)ethyl)phenol
Clinical data
AHFS/Drugs.com
Routes of
administration
Oral, parenteral
Pharmacokinetic data
Protein binding ~56%
Biological half-life 1.7-2.6 hours
Identifiers
CAS Registry Number  Y
ATC code G02
PubChem CID:
IUPHAR/BPS
DrugBank  Y
ChemSpider  Y
UNII  Y
KEGG  Y
ChEMBL  Y
Chemical data
Formula C17H21NO3
Molecular mass 287.354 g/mol
 Y   

Ritodrine (discontinued preparation: Yutopar) is a tocolytic drug, used to stop premature labor.[1] This drug has been removed from the US market, according to FDA Orange Book. It was available in oral tablets or as an injection and was typically used as the hydrochloride salt, ritodrine hydrochloride.

Mechanism

Ritodrine is a beta-2 adrenergic receptor agonist - a class of medication used for smooth muscle relaxation (other similar drugs are used in asthma or other pulmonary diseases such as salbutamol). Since ritodrine has a bulky N-substituent, it has high β2-selectivity. Also, the 4'-hydroxy on the benzene ring is important for activity as it is needed to form hydrogen bonds. However, the 4'-hydroxy makes it susceptible to metabolism by COMT. Since it is β2-selective it is used for premature labor.[2]

Side effects and potential contraindications

Most side effects of beta-2 agonists result from their concurrent beta-1 activity, and include increase in heart rate, rise in systolic pressure, decrease in diastolic pressure, chest pain secondary to MI, and arrhythmia. Beta agonists may also cause fluid retention secondary to decrease in water clearance, which when added to the tachycardia and increased myocardial work, may result in cardiac failure. In addition, they increase gluconeogenesis in the liver and muscle resulting in hyperglycemia, which increases insulin requirements in diabetic patients. The passage of beta-agonists through the placenta does occur and may be responsible for fetal tachycardia, as well as hypoglycemia or hyperglycemia at birth.

Patients with type 2 diabetes, high blood pressure or migraines should bring this to their doctor's attention before receiving care.

It has also been associated with post-partum hemorrhage.

References

  1. ^ Li X, Zhang Y, Shi Z (February 2005). "Ritodrine in the treatment of preterm labour: a meta-analysis" (PDF). The Indian journal of medical research 121 (2): 120–7.  
  2. ^ Medicinal Chemistry of Adrenergics and Cholinergics