Treatment of acute mild to moderate ulcerative proctitis.

Maintenance of remission of ulcerative proctitis.

Posology

Adults and older people:

Acute treatment

One Octasa 1 g Suppository once daily (equivalent to 1 g mesalazine daily) inserted into the rectum.

Maintenance treatment

One Octasa 1 g Suppository once daily (equivalent to 1 g mesalazine daily) inserted into the rectum.

Paediatric population

There is little experience and only limited documentation for an effect in children.

Method of administration

For rectal administration only.

Octasa 1 g Suppositories should be administered preferably at bedtime.

Treatment with Octasa 1 g Suppositories must be administered regularly and consistently, because only in this way can healing be successfully achieved.

Duration of treatment

The duration of use is determined by the physician.

Octasa 1 g Suppositories are contraindicated in patients with:

- known hypersensitivity to salicylates or to the excipient listed in section 6.1

- severe impairment of hepatic or renal function

Blood tests (differential blood count; liver function parameters such as ALT or AST; serum creatinine) and urinary status (dip-sticks) should be determined prior to and during treatment, at the discretion of the treating physician. As a guideline, follow-up tests are recommended 14 days after commencement of treatment, then a further two to three tests at intervals of 4 weeks.

If the findings are normal, follow-up tests should be carried out every 3 months. If additional symptoms occur, these tests should be performed immediately. Caution is recommended in patients with impaired hepatic function.

Octasa 1 g Suppositories should not be used in patients with impaired renal function.

Mesalazine-induced renal toxicity should be considered if renal function deteriorates during treatment.

Cases of nephrolithiasis have been reported with the use of mesalazine including stones with a 100% mesalazine content. It is recommended to ensure adequate fluid intake during treatment.

Patients with pulmonary disease, in particular asthma, should be very carefully monitored during a course of treatment with Octasa 1 g Suppositories.

Patients with a history of adverse drug reactions to preparations containing sulphasalazine should be kept under close medical surveillance on commencement of a course of treatment with Octasa 1 g Suppositories. Should Octasa 1 g Suppositories cause acute intolerance reactions such as abdominal cramps, acute abdominal pain, fever, severe headache and rash, therapy should be discontinued immediately.

Mesalazine may produce red-brown urine discoloration after contact with sodium hypochlorite bleach (e.g. in toilets cleaned with sodium hypochlorite contained in certain bleaches).

Severe cutaneous adverse reactions

Severe cutaneous adverse reactions (SCARs), including Drug reaction with eosinophilia and systemic symptoms (DRESS), Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN), have been reported in association with mesalazine treatment.

Mesalazine should be discontinued, at the first appearance of signs and symptoms of severe skin reactions, such as skin rash, mucosal lesions, or any other sign of hypersensitivity.

Specific interaction studies have not been performed. In patients, who are concomitantly treated with azathioprine, 6-mercaptopurine or thioguanine, a possible increase in the myelosuppressive effects of azathioprine, 6- mercaptopurine or thioguanine should be taken into account. There is weak evidence that mesalazine might decrease the anticoagulant effect of warfarin.

Pregnancy

There are no adequate data on the use of Octasa 1 g Suppositories in pregnant women. However, data on a limited number of exposed pregnancies indicate no adverse effect of mesalazine on pregnancy or on the health of the foetus/newborn child. To date no other relevant epidemiologic data are available.

In one single case after long-term use of a high dose of mesalazine (2-4 g, orally) during pregnancy, renal failure in a neonate was reported.

Animal studies on oral mesalazine do not indicate direct or indirect harmful effects with respect to pregnancy, embryonic/foetal development, parturition or postnatal development.

Octasa 1 g Suppositories should only be used during pregnancy if the potential benefit outweighs the possible risk.

Breastfeeding

N-acetyl-5-aminosalicylic acid and to a lesser degree mesalazine are excreted in breast milk. Only limited experience during lactation in women is available to date.

Hypersensitivity reactions such as diarrhoea in the infant cannot be excluded. Therefore, Octasa 1 g Suppositories should only be used during breastfeeding if the potential benefit outweighs the possible risk. If the infant develops diarrhoea, breastfeeding should be discontinued.

Fertility

No effects on fertility have been observed.

Octasa 1 g Suppositories have no or negligible influence on the ability to drive and use machines.

In clinical studies involving 248 participants, approximately 3% experienced adverse reactions while receiving mesalazine 1g suppositories. The most commonly reported ADRs were headache, in approximately 0.8%, and gastrointestinal side effects (constipation in approximately 0.8%; nausea, vomiting and abdominal pain in 0.4% each).

The following side effects have been reported with the use of mesalazine:

* see section 4.4 for further information

Severe cutaneous adverse reactions (SCARs), including Drug reaction with eosinophilia and systemic symptoms (DRESS), Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN), have been reported in association with mesalazine treatment (see section 4.4).

Photosensitivity

More severe reactions are reported in patients with pre-existing skin conditions such as atopic dermatitis and atopic eczema.

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 Yellow Card Scheme, website: yellowcard.mhra.gov.uk or search for MHRA Yellow Card in the Google Play or Apple App Store

There are rare data on overdosage (e.g. intended suicide with high oral doses of mesalazine), which do not indicate renal or hepatic toxicity. There is no specific antidote and treatment is symptomatic and supportive.

Pharmacotherapeutic group: Aminosalicylic acid and similar agents

ATC code: A07EC02

Mechanism of action

The mechanism of the anti-inflammatory action is unknown. The results of in vitro studies indicate that inhibition of lipoxygenase may play a role. Effects on prostaglandin concentrations in the intestinal mucosa have also been demonstrated. Mesalazine (5-Aminosalicylic acid / 5-ASA) may also function as a radical scavenger of reactive oxygen compounds. On reaching the intestinal lumen, rectally administered mesalazine has largely local effects on the intestinal mucosa and submucosal tissue.

Clinical efficacy and safety

Clinical efficacy and safety of mesalazine 1g suppositories was evaluated in a multicentre phase III study, which included 403 patients with endoscopically and histologically confirmed mild to moderately active ulcerative proctitis. The mean disease activity index (DAI) at base line was 6.2 ± 1.5 (range: 3 – 10). Patients were randomised to treatment with one mesalazine 1g suppository (1 g OD group) or 3 suppositories containing 0.5 g mesalazine (0.5 g TID group per day for 6 weeks. The primary efficacy variable was clinical remission defined as DAI < 4 at the final visit or withdrawal. At the final per protocol analysis, 87.9% of the patients in the 1 g OD group and 90.7% of the 0.5 g TID group were in clinical remission (Intention-to-treat analysis: 1 g OD group: 84.0%; 0.5 g TID group: 84.7%). The mean change in DAI from baseline was -4.7 in both treatment groups. No drug-related serious AEs occurred.

General considerations of mesalazine

Absorption

Mesalazine absorption is highest in proximal gut regions and lowest in distal gut areas.

Biotransformation

Mesalazine is metabolised both pre-systemically by the intestinal mucosa and in the liver to the pharmacologically inactive N-acetyl-5-aminosalicylic acid (N-Ac-5-ASA). The acetylation seems to be independent of the acetylator phenotype of the patient. Some acetylation also occurs through the action of colonic bacteria. Protein binding of mesalazine and N-Ac-5-ASA is 43% and 78%, respectively.

Elimination

Mesalazine and its metabolite N-Ac-5-ASA are eliminated via the faeces (major part), renally (varies between 20 and 50 %, dependent on kind of application, pharmaceutical preparation and route of mesalazine release, respectively), and biliary (minor part). Renal excretion predominantly occurs as N-Ac-5-ASA. About 1 % of total orally administered mesalazine dose is excreted into the breast milk mainly as N-Ac-5-ASA.

Octasa 1 g Suppositories specific:

Distribution

Scintigraphic studies with a similar medicinal product, technetium-labelled mesalazine 500mg suppositories showed peak spread of the suppository that had melted due to body temperature after 2 – 3 hours. The spread was limited primarily to the rectum and rectosigmoid junction. It is assumed that Octasa 1 g Suppositories act very similar and thus are particularly suitable for treating proctitis (ulcerative colitis of the rectum).

Absorption

In healthy subjects and in fasting conditions, mean peak plasma concentrations of 5-ASA after a single rectal dose of 1 g mesalazine (Octasa 1 g Suppository) were 177 ± 86.3 ng/ml (range 2.06 – 872 ng/ml), those of the main metabolite N-Ac-5-ASA were 396 ± 159 ng/ml (range 8.3 – 1500 ng/ml). The median time to reach the peak plasma concentration of 5-ASA was 4.5 h.

Elimination

In healthy subjects and in fasting conditions, after a single rectal dose of 1 g mesalazine (Octasa 1 g Suppository) between 14.5 % and 17.1% of the administered 5-ASA dose were recovered in the urine during 48 hours.

With the exception of a local tolerance study in dogs, which demonstrated good rectal tolerance, no preclinical studies have been performed with mesalazine 1 g Suppositories. Preclinical data on mesalazine reveal no special hazard for humans based on conventional studies of safety pharmacology, genotoxicity, carcinogenicity (rat) or toxicity to reproduction.

Kidney toxicity (renal papillary necrosis and epithelial damage in the proximal convoluted tubule or the whole nephron) has been seen in repeat-dose toxicity studies with high oral doses of mesalazine. The clinical relevance of this finding is unknown.

Hard fat

Not applicable.

3 years

Store in the original container in order to protect contents from light.

Do not store above 30° C. Do not refrigerate or freeze.

Container (strip): PVC/polyethylene film

Pack sizes: 10, 30

Not all pack sizes may be marketed.

Any unused product or waste material should be disposed of in accordance with local requirements.