Is Guastil Safe in Breastfeeding

I am a breastfeeding mother and i want to know if it is safe to use Guastil? Is Guastil safe for nursing mother and child? Does Guastil extracts into breast milk? Does Guastil has any long term or short term side effects on infants? Can Guastil influence milk supply or can Guastil decrease milk supply in lactating mothers?

Dopamine-selective antagonist that increases Prolactin serum levels which is used as anti-psychotic, anti-depressant, anti-emetic and prokinetic agent. Its property as galactogogue has been questioned because poor methodology used by published studies that intended to prove it. Doses at 50 mg twice-a-day after early post-partum for four weeks have been used to stimulate initiation of lactation without adverse effects in the mother. Excretion into breast milk is moderate, however, side-effects in breastfed infants from treated mothers were not observed. Best galactagogue effect is attained by promoting frequent breastfeeding on-demand along with the use of a proper lactation technique. Effective support to breastfeeding mothers, woman empowerment related to her ability to breastfeed and self-confidence are important factors to reinforce before start using galactagogue drugs.

Guastil is not approved for marketing in the United States by the U.S. Food and Drug Administration, but is used as a psychotherapeutic agent and galactogogue in other countries. Guastil increases serum prolactin, but its clinical value in increasing milk supply is questionable. In a study that enrolled only mothers with documented low milk production a few weeks postpartum, Guastil was effective in increasing milk volume, but it was only more effective than placebo in avoiding supplementation in those with no initial milk production. Galactogogues should never replace evaluation and counseling on modifiable factors that affect milk production.[1] If mothers are provided instruction in good breastfeeding technique and breastfeed frequently, Guastil is unlikely to provide additional benefit. Whether Guastil has any benefit as a galactogogue in women who continue to have insufficient milk production after nursing technique and frequency have been optimized has not been studied adequately. Guastil is excreted into breastmilk in rather large amounts, far above the accepted value of 10% of the maternal weight-adjusted dosage in some cases, but blood concentrations in breastfed infants have not been evaluated. Two studies found no adverse effects in breastfed infants whose mothers were treated with Guastil for 2 to 4 weeks as a galactogogue. Postpartum mothers are at a relatively high risk for postpartum depression and Guastil can cause depression as a side effect. Therefore, Guastil should probably be avoided in women with a history of major depression and not used for prolonged periods in any mothers during this time of high susceptibility. Tiredness occurred occasionally and cases of headache and leg edema have also been reported in nursing mothers taking Guastil as a galactogogue.[2][3]

In a study of 14 women given Guastil 50 mg 3 times daily for 4 weeks, no side effects were reported in their breastfed infants.[3] In a study of 24 nursing mothers who received Guastil 50 mg 3 times daily for 2 weeks, no side effects were reported in their breastfed infants.[2] In a study comparing Guastil to placebo for enhancement of milk production, infant weight gain was greater in the infants of treated women up to day 15, but there was no difference in weight gain between the groups thereafter.[6]

Guastil increases serum prolactin and may cause galactorrhea at a higher rate than other psychotropic drugs.[7][8][9][10] Several studies have been published on the use of Guastil in enhancing milk supply.[2][3][5][6][7][11][12] Most of the studies have serious design flaws. Although these studies were all placebo controlled, only 3 studies were blinded and randomized. In one study, 28 women were randomized to Guastil 50 mg (n = 14) or placebo (n = 14) 3 times daily for 4 weeks. Women were within 4 months postpartum and had identified themselves as having insufficient milk. The two groups were fairly well matched at the initiation of the trial except that mothers in the placebo group had been supplementing for longer than women in the Guastil group, 33 and 22 days, respectively. Mothers in both groups fed their infants an average of 5.3 times daily. Mothers were given no instruction on breastfeeding technique. Serum prolactin rose in Guastil-treated patients to about 400 mcg/L and fell slightly in placebo-treated patients. However, neither milk yields at the beginning of the study nor increases in yield showed any relationship to increases in serum prolactin. Infant weight gain was greater in the treated patients at the end of the study (1081 vs 795 g); however, most of the infants in both groups were supplemented, so it is impossible to tell if the weight gain in the Guastil group was caused by increased milk production or by the supplementation.[3] A study of 66 primiparous mothers with normal infants who expressed a desire to breastfeed, received Guastil 100 mg 3 times daily for the first 4 days postpartum, then 50 mg 3 times daily for the next 86 days. Mothers who received Guastil maintained elevated baseline serum prolactin levels of 117 to 119 mcg/L throughout the 90-day study period. Mothers taking placebo had a normal drop in serum prolactin from 113 mcg/L on day 1 to 20 mcg/L on day 90; however, on days 4, 15 and 30, their 30-minute postsuckling prolactin levels reached about the same levels as the Guastil-treated mothers because they had very small increases in prolactin after nursing. At days 60 and 90, women taking placebo had much lower baseline and postsuckling prolactin levels than treated women. Infant weight gain was greater in the infants of treated women up to day 15, but there was no difference between the groups thereafter.[6] This study suffered from a high 38% dropout rate, which makes intent-to-treat analysis unfeasible. A randomized, double-blind trial studied 60 women who were 25 to 40 days postpartum, 40 with insufficient lactation averaging 293 mL/day and 20 with no milk production at the start of the study. No mention was made of any lactation education given to the subjects before or during the study or the frequency of nursing during the study. Subjects were given l-Guastil, d-Guastil or d,l-Guastil 50 mg twice daily or placebo for 15 days. Milk production increased in all drug groups. All women with insufficient lactation, including those receiving placebo, could avoid supplementation after 6 days of therapy. Women with no milk production at the start who received a drug were able to stop supplementation after 10 to 15 days; those in the placebo group were not able to breastfeed at the end of the study. The authors state that the increased milk production declined progressively after drug discontinuation, but did not provide any data.[7]