DEPONIT Transdermal patch Ref.[27650] Active ingredients: Glyceryl trinitrate

Warnings

In cases of recent myocardial infarction or acute heart failure, treatment with the preparation should be carried out cautiously under strict medical surveillance and/or haemodynamic monitoring.

Removal of the patch should be considered as part of the management of patients who develop significant hypotension.

Precautions

This patch should be used with caution in patients with

• Severe hepatic or renal impairment
• Hypothyroidism
• Hypothermia
• Malnutrition
• A recent history of myocardial infarction
• Hypoxaemia or a ventilation/perfusion imbalance due to lung disease or ischaemic heart failure.
• Arterial Hypoxaemia due to severe anaemia (including G6PD deficiency induced forms), because in such patients the biotransformation of nitroglycerin is reduced.
• Alveolar hypoventilation a vasoconstriction occurs within the lung to shift perfusion from areas of alveolar hypoxia to better ventilated regions of the lung (Von Euler–Liljestrand mechanism).
• Angina pectoris, myocardial infarction, or cerebral ischaemia frequently suffer from abnormalities of the small airways (especially alveolar hypoxia).Under these circumstances vasoconstriction occurs within the lung to shift perfusion from areas of alveolar hypoxia to better ventilated regions of the lung. As a potent vasodilator, nitroglycerin could reverse this protective vasoconstriction and thus result in increased perfusion of poorly ventilated areas, worsening of the ventilation/perfusion imbalance, and a further decrease in the arterial partial pressure of oxygen.
• Methemoglobinemia

Following treatment with GTN, methemoglobinemia has been reported. Treatment of methaemoglobinemia with methylene blue is contraindicated in patients with glucose-6-phosphate deficiency or methemoglobin-reductase deficiency (see also section 4.9).

The patch is not indicated for use in acute angina attacks. In the event of an acute angina attack, sublingual treatment such as a spray or tablet should be used.

As with all nitrate preparations withdrawal of long-term treatment should be gradual by replacement with decreasing doses of long acting oral nitrates.

Also when transferring the patient on long-term therapy to another form of medication, nitroglycerin should be gradually withdrawn and overlapping treatment started.

If the patches are not used as indicated (see Section 4.2) tolerance to the medication could develop.

Patients should be warned not to discontinue or interrupt GTN patch therapy in order to use phosphodiesterase inhibitor-containing products (e.g. sildenafil, vardenafil, tadalafil).

During treatment with GTN alcohol should be avoided as it may potentiate the hypotensive and vasodilating effect of GTN (see section 4.5).

Concomitant treatment with other vasodilators (e.g. phosphodiesterase inhibitors such as sildenafil, vardenafil, tadalafil), calcium channel antagonists, ACE-inhibitors, monoamine oxidase inhibitors, beta-blockers, diuretics, antihypertensives, tricyclic antidepressants and major tranquillisers, as well as the consumption of alcohol, may potentiate the hypotensive effect of the preparation.

The blood pressure lowering effect of these patches will be increased if used together with phosphodiesterase inhibitors (e.g. sildenafil, vardenafil, tadalafil) which are used for erectile dysfunction (see Section 4.3). This might lead to life threatening cardiovascular complications. Patients who have recently taken phosphodiesterase inhibitors (e.g. sildenafil, vardenafil, tadalafil) therefore must not be treated with GTN. Patients who are on nitrate patch therapy therefore must not use phosphodiesterase inhibitors (e.g. sildenafil, vardenafil, tadalafil).

The use of GTN with riociguat, a soluble guanylate cyclase stimulator, is contraindicated (see section 4.3) since concomitant use can cause hypotension.

If administered concurrently, these patches may increase the blood level of dihydroergotamine and lead to coronary vasoconstriction.

The possibility that ingestion of non-steroidal anti-inflammatory drugs except Acetyl Salicylic acid might diminish the therapeutic response to the patch cannot be excluded.

Concurrent administration with Amifostine and acetyl salicylic acid may potentiate the hypotensive effect of the preparation.

Sapropterine (Tetrahydrobiopterine, BH4) is a cofactor for nitric oxide synthetase. Caution is recommended during concomitant use of sapropterine-containing medicine with all agents that cause vasodilation by affecting nitric oxide (NO) metabolism or action, including classical NO donors (e.g. glyceryl trinitrate (GTN), isosorbide dinitrate (ISDN), isosorbide 5-mononitrate (5-ISMN) and others).

Pregnancy and breast-feeding

Like any drug, Deponit 5 should be employed with caution during pregnancy, especially in the first 3 months.

These patches should not be used during pregnancy or lactation unless considered absolutely essential by the physician.

It is not known whether the active substance passes into the breast milk. Benefits to the mother must be weighed against risk to the child.

Fertility

Reproduction toxicity studies performed in rats and rabbits using various routes of administration did not reveal any effect on mating, fertility and general reproductive parameters. There is no data available on the effect of Deponit 5 on fertility in humans.

Glyceryl trinitrate can cause postural hypotension and dizziness. Patients should not drive or operate machinery if they feel affected.

Undesirable effects frequencies are defined as: very common (≥1/10), common (≥1/100,<1/10), uncommon (≥1/1,000,<1/100), rare ≥1/10,000,<1/1,000), very rare (<1/10,000), not known (cannot be estimated from the available data).

During administration of Deponit 5 the following undesirable effects may be observed:

Severe hypotensive responses have been reported for organic nitrates and include nausea, vomiting, restlessness, pallor and excessive perspiration.

During the treatment with these patches, a temporary hypoxaemia may occur due to a relative redistribution of the blood flow in hypoventilated alveolar areas. Particularly in patients with coronary artery disease this may lead to a myocardial hypoxia.

Like other nitrate preparations, GTN commonly causes dose-dependent headaches due to cerebral vasodilation. These often regress after a few days despite the maintenance of therapy. If headaches persist during intermittent therapy, they should be treated with mild analgesics. Unresponsive headaches are an indication for reducing the dosage of GTN or discontinuing treatment.

A slight reflex-induced increase in heart rate can be avoided by resorting, if necessary, to combined treatment with a beta-blocker.

Upon removal of the patch, any slight reddening of the skin will usually disappear within a few hours. The application site should be changed regularly to prevent local irritation.

Reporting of suspected adverse reactions

Reporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit/risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions via the Yellow Card Scheme Website: www.mhra.gov.uk/yellowcard or search for MHRA Yellow Card in the Google Play or Apple App Store.

By reporting side effects, you can help provide more information on the safety of this medicine.

Not applicable.