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Tiotropium
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| Systematic (IUPAC) name | |
| (1α,2β,4β,7β)- 7-[(hydroxidi-2-thienylacetyl)oxy]-9,9-dimethyl- 3-oxa-9-azoniatricyclo[3.3.1.02,4nonane |
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| Identifiers | |
| CAS number | |
| ATC code | R03 |
| PubChem | |
| DrugBank | |
| Chemical data | |
| Formula | C19H22NO4S2+ |
| Mol. mass | 490.4 |
| SMILES | & |
| Pharmacokinetic data | |
| Bioavailability | 19.5% (inhalation) |
| Metabolism | hepatic 25% (CYP2D6, CYP3A4) |
| Half life | 5–6 days |
| Excretion | renal |
| Therapeutic considerations | |
| Pregnancy cat. |
B1(AU) |
| Legal status | |
| Routes | inhalation (oral) |
Tiotropium (pronounced /ˌtaɪəˈtroʊpiəm/) (administered as tiotropium bromide) is a long-acting, 24 hour, anticholinergic bronchodilator used in the management of chronic obstructive pulmonary disease (COPD). Tiotropium bromide (INN) capsules for inhalation are co-marketed by Boehringer-Ingelheim and Pfizer under the trade name "Spiriva".
Contents |
Mode of delivery
The patient removes one tiotropium capsule from the blister pack, places it into the piercing chamber of the inhalation device and closes the mouthpiece.
The capsule is manually pierced, and the medication is inhaled through the mouthpiece. It is recommended that inhalations are repeated 2 to 3 times to ensure all medication is drawn from the capsule. When properly done, the capsule will make a distinctive flutter or rattle, audible to the patient.
Once the powder capsules are removed from the blister pack, it should immediately taken, via through the inhalation device. If a capsule is exposed to the air it will rapidly degrade to the point the dose will become ineffective. Any previously exposed capsules should be discarded.
The capsules cannot be taken orally - they will not be effective as respiratory medication if absorbed through the gastrointestinal tract and may have side effects if absorbed via this route.
Mode of action
Tiotropium is a muscarinic receptor antagonist, often referred to as an antimuscarinic or anticholinergic agent. Although it does not display selectivity for specific muscarinic receptors, on topical application it acts mainly on M3 muscarinic receptors located in the airways to produce smooth muscle relaxation, thus producing a bronchodilatory effect.
Clinical use
Indications
Tiotropium is indicated as a daily, 24 hour, maintenance treatment of chronic obstructive pulmonary disease (COPD).
Adverse effects
Adverse effects are mainly related to its antimuscarinic effects. Common adverse drug reactions (≥1% of patients) associated with tiotropium therapy include: dry mouth and/or throat irritation. Rarely (<0.1% of patients) treatment is associated with: urinary retention, constipation, acute angle closure glaucoma, palpitations, and/or allergy (rash, angioedema, anaphylaxis) (Rossi, 2006). A study of more than 15,000 patients published in the Journal of the American Medical Association has linked tiotropium and another member of its class ipratropium to increased risk of heart attacks, stroke and cardiovascular death (Singh, 2008)
References
- Rossi S, editor. Australian Medicines Handbook 2006. Adelaide: Australian Medicines Handbook; 2006
- Singh S, Loke YK, Furberg CD. Inhaled anticholinergics and the risk of major adverse cardiovascular events. JAMA 2008;300(12)1439-1450.
See also
External links
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Wikipedia content modification information:
- This page was last modified on 25 September 2008, at 23:36.
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