Bimatoprost + Timolol


Concise Prescribing Info
Indications/Uses
Listed in Dosage.
Dosage/Direction for Use
Adult : Ophth Open-angle glaucoma; Ocular HTN In patients who are insufficiently responsive to topical β-blockers or prostaglandin analogues: Each mL of soln contains bimatoprost 0.3 mg and timolol 5 mg: Instill 1 drop in the affected eye(s) once daily, either in the morning or in the evening at the same time each day.
Dosage Details
Ophthalmic
Ocular hypertension, Open-angle glaucoma
Adult: In patients who are insufficiently responsive to topical β-blockers or prostaglandin analogues: Each mL of soln contains bimatoprost 0.3 mg and timolol 5 mg: Instill 1 drop in the affected eye(s) once daily, either in the morning or in the evening at the same time each day.
Contraindications
Reactive airway disease including bronchial asthma or history of bronchial asthma, severe COPD; sinus bradycardia, sick sinus syndrome, SA block, 2nd or 3rd degree AV block, not controlled w/ pacemaker; overt cardiac failure, cardiogenic shock.
Special Precautions
Patient w/ CV diseases (e.g. CHD, Prinzmetal’s angina, cardiac failure), hypotension therapy w/ β-blockers; severe peripheral circulatory disturbance/disorders (i.e. severe forms of Raynaud's disease/syndrome); mild to moderate COPD; patient subject to spontaneous hypoglycaemia or to patient w/ labile diabetes; corneal diseases. Hepatic or renal impairment. Pregnancy and lactation.
Adverse Reactions
Headache, dizziness; conjunctival hyperaemia, superficial punctuate keratitis, corneal erosion, burning sensation, eye pruritus, dryness, pain, discharge, and irritation, stinging sensation in the eye, foreign body sensation in the eye, foreign body sensation, eyelid erythema, pruritus, and oedema, photophobia, visual disturbance, visual acuity worsened, blepharitis, epiphora, growth of eyelashes; rhinitis, blepharal pigmentation, hirsutism, periocular skin hyperpigmentation.
Patient Counseling Information
This drug may cause transient blurred vision, if affected, do not drive or operate machinery.
Drug Interactions
Additive effects resulting in hypotension and/or marked bradycardia w/ oral Ca channel blockers, guanethidine, β-blockers, parasympathomimetics, anti-arrhythmics, digitalis glycosides. Potentiation of systemic β-blockade (e.g. decreased heart rate, depression) w/ CYP2D6 inhibitors (e.g. quinidine, fluoxetine, paroxetine). Combination w/ epinephrine may cause mydriasis.
Action
Description: Bimatoprost is a synthetic prostamide structurally related to prostaglandin F which reduces intraocular pressure (IOP) by increasing aqueous humour outflow through the trabecular meshwork and enhancing uveoscleral outflow. Timolol is a β1 and β2 non-selective adrenergic receptor blocking agent which lowers IOP by reducing aqueous humour formation. Bimatoprost and timolol decrease elevated IOP by complementary mechanisms of action and the combined effect results in additional IOP reduction compared to either compd administered alone.
Pharmacokinetics:
Absorption: Bimatoprost: Small amounts are absorbed (ophth). Time to peak plasma concentration: W/in 10 min. Timolol: Time to peak plasma concentration: Approx 1-2 hr.
Distribution: Bimatoprost: Moderately distributed into body tissues. Volume of distribution: 0.67 L/kg. Plasma protein binding: Approx 88%.
Metabolism: Bimatoprost: Undergoes oxidation, de-ethylation and glucuronidation. Timolol: Undergoes partial hepatic metabolism.
Excretion: Bimatoprost: Mainly via urine (up to 67%); faeces (approx 25%). Elimination half-life: 45 min. Timolol: Via urine as unchanged drug and metabolites. Plasma half-life: Approx 4-6 hr.
Chemical Structure

Chemical Structure Image
Bimatoprost

Source: National Center for Biotechnology Information. PubChem Database. Bimatoprost, CID=5311027, https://pubchem.ncbi.nlm.nih.gov/compound/Bimatoprost (accessed on Jan. 21, 2020)


Chemical Structure Image
Timolol

Source: National Center for Biotechnology Information. PubChem Database. Timolol, CID=33624, https://pubchem.ncbi.nlm.nih.gov/compound/Timolol (accessed on Jan. 21, 2020)

References
Buckingham R (ed). Bimatoprost. Martindale: The Complete Drug Reference [online]. London. Pharmaceutical Press. https://www.medicinescomplete.com. Accessed 04/03/2016.

Buckingham R (ed). Timolol Maleate. Martindale: The Complete Drug Reference [online]. London. Pharmaceutical Press. https://www.medicinescomplete.com. Accessed 04/03/2016.

Joint Formulary Committee. Bimatoprost with Timolol. British National Formulary [online]. London. BMJ Group and Pharmaceutical Press. https://www.medicinescomplete.com. Accessed 04/03/2016.

Disclaimer: This information is independently developed by MIMS based on Bimatoprost + Timolol from various references and is provided for your reference only. Therapeutic uses, prescribing information and product availability may vary between countries. Please refer to MIMS Product Monographs for specific and locally approved prescribing information. Although great effort has been made to ensure content accuracy, MIMS shall not be held responsible or liable for any claims or damages arising from the use or misuse of the information contained herein, its contents or omissions, or otherwise. Copyright © 2020 MIMS. All rights reserved. Powered by MIMS.com
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