Rizmoic

Rizmoic Uses, Dosage, Side Effects, Food Interaction and all others data.

Rizmoic is an opioid receptor antagonist [FDA Label]. It is a modified form of Naltrexone to which a side chain has been added to increase molecular weight and polar surface area resulting in restricted transport across the blood brain barrier. Rizmoic was approved in 2017 in both the US and Japan for the treatment of Opioid-induced Constipation.

Rizmoic is an opioid receptor antagonist with restricted movement across the blood brain barrier [FDA Label]. This allows it to antagonize the periperal effects of opioid drugs such as constipation without interfering with the effects on the central nervous system.

Trade Name Rizmoic
Availability Prescription only
Generic Naldemedine
Naldemedine Other Names Naldemedine
Related Drugs Amitiza, Movantik, lubiprostone, Relistor, naloxegol, methylnaltrexone
Type Tablet
Formula C32H34N4O6
Weight Average: 570.646
Monoisotopic: 570.247834831
Protein binding

Naldemedine is 93-94% bound to human plasma proteins [FDA Label].

Groups Approved, Investigational
Therapeutic Class
Manufacturer Shionogi
Available Country United Kingdom
Last Updated: September 19, 2023 at 7:00 am
Rizmoic
Rizmoic

Uses

Rizmoic is an opioid antagonist used to to treat opioid-induced constipation.

For the treatment of opioid-induced constipation [FDA Label].

Rizmoic is also used to associated treatment for these conditions: Opioid Induced Constipation (OIC)

How Rizmoic works

Rizmoic binds to and antagonizes mu-, delta-, and kappa-opioid receptors [FDA Label]. The binding of opioid agonists to peripheral mu-opioid receptors slows the transit of feces through the intestine resulting in constipation. By antagonizing mu-opioid receptors, naldemedine inhibits this effect.

Toxicity

The most common adverse effects of naldemedine are abdominal pain (11%), diarrhea (7%), nausea (6%), vomiting (3%), and gastroenteritis (3%) [FDA Label].

Food Interaction

  • Avoid St. John's Wort. This herb induces CYP3A metabolism and may reduce serum levels of naldemedine.
  • Take with or without food.

[Moderate] GENERALLY AVOID: Grapefruit juice may increase the plasma concentrations of naldemedine.

The proposed mechanism is inhibition of CYP450 3A4-mediated first-pass metabolism in the gut wall by certain compounds present in grapefruit.

In pharmacokinetic studies, naldemedine systemic exposure (AUC) was increased approximately 90% by the moderate CYP450 3A4 inhibitor fluconazole and nearly 200% by the potent inhibitor itraconazole.

The interaction has not been studied with grapefruit juice.

In general, the effect of grapefruit juice is concentration-, dose- and preparation-dependent, and can vary widely among brands.

Certain preparations of grapefruit juice (e.g., high dose, double strength) have sometimes demonstrated potent inhibition of CYP450 3A4, while other preparations (e.g., low dose, single strength) have typically demonstrated moderate inhibition.

Increased exposure to naldemedine may precipitate opioid withdrawal symptoms such as hyperhidrosis, lacrimation, rhinorrhea, chills, diarrhea, abdominal pain, anxiety, insomnia, irritability, restlessness, and yawning.



Food does not significantly affect the overall bioavailability of naldemedine.

When administered with a high-fat meal, the rate of naldemedine absorption was decreased, but not the extent.

Specifically, naldemedine peak plasma concentration (Cmax) was decreased by approximately 35% and time to achieve Cmax was delayed from 0.75 hours in the fasted state to 2.5 hours in the fed state, while naldemedine AUC was not significantly changed.

MANAGEMENT: Rizmoic may be taken with or without food.

Patients should avoid consumption of grapefruit and grapefruit juice during treatment with naldemedine.

Volume of Distribution

The apparent volume of disribution during the terminal phase is 155 L [FDA Label]

Elimination Route

Tmax is 0.75 h [FDA Label]. Administration with a high-fat meal reduces Cmax by 35% and increases Tmax to 2.5 h.

Half Life

The terminal elimination half life is 11 h [FDA Label].

Elimination Route

57% of naldemedine is excreted in the urine with 16-18% as the parent compound and 35% is excreted in the feces [FDA Label].

Innovators Monograph

You find simplified version here Rizmoic

*** Taking medicines without doctor's advice can cause long-term problems.
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