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POSSIBLY INEFFECTIVE

• Abortion. Despite traditional use for the induction of second trimester abortion, most research shows that intravaginal laminaria does not significantly reduce time to delivery or improve abortion rates, and it may actually worsen some outcomes when compared with standard of care. Details: One clinical study shows that intravaginal administration of laminaria along with misoprostol does not improve second trimester abortion rates at 24 and 48 hours after treatment initiation when compared with using only misoprostol. Also, using laminaria along with misoprostol does not shorten delivery time when compared with misoprostol alone (95688). Another small clinical study shows that adding intravaginal laminaria to misoprostol therapy significantly increases induction time and the need for opioid analgesics when compared with misoprostol alone (109576). Also, a small clinical study in patients undergoing second trimester abortions shows that intravaginal laminaria increases pain with cervical ripening and induction-to-delivery time when compared with mifepristone (109577). A retrospective study in 126 patients undergoing second trimester abortions has found that intravaginal administration of laminaria (Dilateria, Cooper Surgical) one day before using misoprostol might actually prolong delivery time by about 6 hours and does not improve abortion rates at 24 hours after induction when compared with misoprostol alone (105806). Some research shows that intravaginal administration of laminaria (Dilateria, Milex Products Inc.) one day before using prostaglandin E2 (PGE2) suppositories to induce second trimester abortions shortens the delivery time by about 3 hours when compared with PGE2 suppositories alone; however, the incidence of febrile episodes is about 2.3-fold higher for patients treated with laminaria (94045). Also, one small clinical study shows that intravaginal administration of laminaria the night before a scheduled abortion reduces procedure time by around 4 minutes, increases cervical dilation at the time of abortion, and reduces the need for additional dilation when compared with misoprostol treatment on the day of abortion. However, more patients preferred misoprostol over laminaria (109575). Laminaria has also been compared with a mechanical cervical dilation device, called Dilapan-S. A small clinical study in patients undergoing second trimester surgical abortion shows that intravaginal administration of laminaria for cervical preparation has no effect on pain scores or analgesic use following dilator placement or dilation and evacuation (D&E) when compared with Dilapan-S. The validity of these findings may be limited by the single-blinded nature of the study, as well as significant baseline differences between the treatment groups with respect to vaginal parity (105805).
• Parturition. Intravaginal administration of laminaria does not seem to be beneficial for cervical ripening. Details: While some research suggests that intravaginal laminaria might reduce the duration of induction, results are conflicting. Additionally, studies suggest that intravaginal laminaria does not seem to reduce the incidence of birth by caesarean section (8945,95689,102765). Also, a small observational study has found that intravaginal laminaria is associated with a greater risk of endometritis and fetal infectious complications when compared with a control group not receiving laminaria (8945).

INSUFFICIENT RELIABLE EVIDENCE to RATE

• Acute radiation syndrome. Although there has been interest in using oral laminaria for acute radiation syndrome, there is insufficient reliable information about the clinical effects of laminaria for this purpose.
• Cancer. Although there has been interest in using oral laminaria for cancer prevention, there is insufficient reliable information about the clinical effects of laminaria for this purpose.
• Hypertension. Although there has been interest in using oral laminaria for hypertension, there is insufficient reliable information about the clinical effects of laminaria for this purpose.
• Obesity. It is unclear if oral laminaria is beneficial in patients with obesity. Details: A small clinical study in overweight Japanese adults shows that taking iodine-reduced laminaria powder 2 grams, providing 1 gram of alginate, three times daily for 8 weeks reduces body fat percentage in males, but not females, when compared with placebo. Laminaria does not affect body weight or body mass index when compared with placebo (109572).
• Radiation exposure. Although there has been interest in using oral laminaria to minimize environmental radiation exposure, there is insufficient reliable information about the clinical effects of laminaria for this purpose. More evidence is needed to rate laminaria for these uses.

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LIKELY SAFE ...when used in amounts found in foods. Laminaria has Generally Recognized as Safe (GRAS) status in the US (94048).

POSSIBLY SAFE ...when iodine-reduced laminaria supplements are used, short-term. Iodine-reduced laminaria powder has been safely used at doses up to 6 grams daily for up to 8 weeks (109572).

POSSIBLY UNSAFE ...when used orally in medicinal amounts. The average laminaria-based supplement might contain as much as 1000 mcg of iodine. Ingesting more than 1100 mcg iodine daily (the tolerable upper intake level) can cause hypothyroidism, hyperthyroidism, or exacerbate existing hyperthyroidism (9556,94046). In addition, some laminaria supplements may contain arsenic (645,10275,15588). There is insufficient reliable information available about the safety of laminaria for its other uses.

PREGNANCY: POSSIBLY UNSAFE
when used intravaginally for cervical ripening; there is an increased risk of parental and neonatal infection (8945).

PREGNANCY: LIKELY UNSAFE
when used intravaginally to induce labor; use has been associated with endometriosis, neonatal sepsis, fetal hypoxia, and intrauterine death (6).

PREGNANCY: UNSAFE
when used orally due to potential hormonal effects (19); avoid using.

LACTATION: LIKELY UNSAFE
when used orally because of potential toxicity (19).

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ACE INHIBITORS (ACEIs) Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, laminaria might increase the risk of hyperkalemia when taken with ACEIs.  Details Laminaria contains potassium (19).

AMIODARONE (Cordarone) Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, combining laminaria with amiodarone might cause excessively high iodine levels.  Details Amiodarone contains 37.3% iodine and can increase iodine levels. Concomitant use with laminaria supplements, some of which may contain as much as 1000 mcg iodine, might increase the risk of adverse effects from iodine, including altered thyroid function (9556,94046).

ANTITHYROID DRUGS Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Due to its iodine content, laminaria might alter the effects of antithyroid drugs.  Details Some laminaria supplements contain up to 1000 mcg of iodine (9556,94046). Iodine in high doses has been reported to cause both hyperthyroidism and hypothyroidism, depending on the individual's past medical history. Taking laminaria could theoretically alter the effects of antithyroid drugs.

DIGOXIN (Lanoxin) Interaction Rating = Moderate Be cautious with this combination. Severity = High •  Occurrence = Possible •  Level of Evidence = D Theoretically, laminaria might increase the risk of hyperkalemia, which could increase the effects and adverse effects of digoxin.  Details Laminaria contains potassium (19).

POTASSIUM-SPARING DIURETICS Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Theoretically, laminaria might increase the risk of hyperkalemia when taken with potassium-sparing diuretics.  Details Laminaria contains potassium (19).

THYROID HORMONE Interaction Rating = Moderate Be cautious with this combination. Severity = Moderate •  Occurrence = Possible •  Level of Evidence = D Due to its iodine content, laminaria might alter the effects of thyroid hormone.  Details Some laminaria supplements contain up to 1000 mcg of iodine (9556,94046). Iodine in high doses has been reported to cause both hyperthyroidism and hypothyroidism, depending on the individual's past medical history. Taking laminaria could theoretically alter the effects of thyroid hormone.

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General ...Orally, iodine-reduced laminaria seems to be well tolerated, while other laminaria formulations may contain excess amounts of iodine, as well as arsenic.
Most Common Adverse Effects:
Intravaginally: Cervical bleeding and pelvic cramps.
Serious Adverse Effects (Rare):
Orally: Arsenic poisoning.
Intravaginally: Rupture of cervical wall, fetal hypoxia, and fetal death. Anaphylaxis in sensitive individuals.

Dermatologic ...Orally, laminaria has been linked to a report of induced or exacerbated acne (9555).

Endocrine ...Orally, laminaria can affect levels of certain thyroid hormones, and might cause hypothyroidism or hyperthyroidism, or exacerbate existing hyperthyroidism (9556,94046).

Genitourinary ...Intravaginally, laminaria used for cervical ripening can cause pelvic cramps and cervical bleeding (8945). Uterine contractions associated with laminaria use have been implicated in fetal hypoxia and subsequent intrauterine death (6). Use of endocervical laminaria tents has been associated with possible rupture of the cervical wall and subsequent neonatal and parental infection (6,8945).

Immunologic ...There are case reports of anaphylactic reactions to laminaria when used intravaginally as a cervical dilator. In at least one case, ventilation was required (102766).

Other ...Laminaria concentrates arsenic from the ocean. In one case, use of an oral laminaria supplement for several months resulted in symptoms of arsenic poisoning including headache, weakness, fatigue, worsening memory loss, rash, nail damage, diarrhea, and vomiting. Urinary arsenic levels were elevated (15588). The concentration of arsenic in laminaria may vary between different batches, and also depends upon the part of the world where it was harvested (645,10275,15588). The concentration of arsenic has been reported to be higher in preparations from Australia than from Great Britain (645,10275).

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