毒理性
哺乳期使用概述:曲马多的排泄进入乳汁是低的,其活性代谢物O-去甲基曲马多的排泄量甚至更低。在常规的母体剂量下,排入乳汁的量远少于给予新生儿镇痛的剂量。在哺乳的新生儿中进行的研究没有发现可归因于曲马多的不良反应。然而,一名对曲马多上瘾的妇女的8个月大哺乳婴儿死亡,尽管单独的哺乳暴露可能并不足以导致死亡。尽管曲马多在常规母体剂量下不太可能对哺乳婴儿产生不利影响,但美国食品药品监督管理局和制造商建议在哺乳期间不要使用曲马多。如果使用曲马多,监测婴儿是否出现过度嗜睡(比平时更多)、哺乳困难、呼吸困难或无力,如果出现这些症状,请立即联系医生。
◉ 对哺乳婴儿的影响:对75名母亲在剖宫产后服用每6小时100毫克曲马多并哺乳的婴儿与75名同龄的匹配婴儿进行了比较。49%服用曲马多的母亲和所有对照组的母亲都在服用其他阿片类药物(主要是奥昔康),分别有61%和58%也在服用非甾体抗炎药(主要是双氯芬酸)。儿科医生检查发现两组在使用神经学和适应能力评分方面没有差异。
一名8个月大的婴儿因意识改变、低氧血症、低血压和低血细胞比容被带到埃及的一家急诊科。在ICU中,婴儿的尿检对曲马多呈阳性,对大麻和阿片类药物呈阴性。两剂纳洛酮改善了她的血气,两天后她的精神状态有所改善。婴儿的父母表示他们对曲马多上瘾,母亲正在哺乳婴儿。婴儿在入院3天后出院。36小时后,婴儿再次出现在急诊科,出现心肺骤停,格拉斯哥昏迷量表评分为4,出现全身性强直-阵挛性癫痫。婴儿在入院3天后因心脏骤停而死亡。母亲表示,在从医院初次出院后,她曾哺乳过婴儿。作者推测,母亲或婴儿可能是超快CYP2D6代谢者,导致活性代谢物水平升高,因为这种变异在地中海血统的人中相对常见。然而,既没有进行基因测试,也没有测量乳汁或婴儿中的曲马多水平。这个案例不能肯定地归因于单纯的哺乳暴露,因为8个月大时症状的突然发作似乎不太可能。更有可能的是,婴儿直接摄入了曲马多。
一家日本医院为产后母亲提供了一种含有曲马多37.5毫克和对乙酰氨基酚325毫克的复合片剂,如果她们要求使用止痛药,则每6小时服用一次,连续服用3天。一项回顾性分析发现,在148名接受该药物的母亲中,所有婴儿都进行了哺乳,没有一个婴儿出现不良反应,如嗜睡、哺乳困难或呼吸问题。相对较低的剂量和短期的治疗可能降低了不良反应的风险。
一项对过去12个月内哺乳的母亲进行的横断面调查确定了142名在哺乳期间服用过一种或多种药物的母亲。其中一名服用曲马多的母亲报告说,她的婴儿出现了嗜睡,这导致她改变了哺乳的时间。
◉ 对泌乳和乳汁的影响:曲马多可以提高血清催乳素水平。然而,对于已经建立泌乳的母亲来说,催乳素水平可能不会影响她的哺乳能力。
一项随机研究比较了曲马多和萘普生用于剖宫产后疼痛的治疗。患者按照固定的时间表或按需服用药物。各组之间的哺乳率没有差异。
在中国的一项研究中,预定进行剖宫产的女性被随机分配接受静脉患者控制镇痛,使用 sufentanil 或曲马多。曲马多组的产后催乳素水平(348 mcg/L)高于 sufentanil 组(314 mcg/L)。曲马多组的泌乳开始时间(21.4小时)早于 sufentanil 组(25.1小时)。这两个差异在统计学上都是显著的。注射用曲马多在美国不可用。
在塞尔维亚一家医院对接近足月进行剖宫产的女性进行的非随机、非盲法研究中,比较了全身麻醉(n = 284)和脊髓或硬脊膜外麻醉(n = 249)。脊髓麻醉包括12 mg重比重布比卡因和0.01 mg芬太尼;硬脊膜外麻醉包括0.5%等比重布比卡因(每10 cm高度0.5 mg)和0.05 mg芬太尼。全身麻醉包括2.3 mg/kg丙泊酚和1.5 mg/kg琥珀胆碱用于诱导和插管,随后使用麻醉气体混合物和氧气。据报道,在分娩前后,一氧化氮(可能是氧化亚氮)在气体中的比例分别为50%和67%。在某些情况下还使用了七氟醚。在分娩和脐带结扎后,母亲静脉注射
◉ Summary of Use during Lactation:The excretion of tramadol into milk is low and even lower amounts of the active metabolite, O-desmethyltramadol, are excreted. With usual maternal dosage, the amount excreted into breastmilk is much less than the dose that has been given to newborn infants for analgesia. Studies in breastfed newborn infants found no adverse effects attributable to tramadol. However, a death occurred in the 8-month-old breastfed infant of a woman addicted to tramadol, although breastfeeding exposure alone might not have accounted for the death. Although tramadol is unlikely to adversely affect nursing infants with usual maternal dosages, the U.S. Food and Drug Administration and the manufacturer recommend against the use of tramadol during breastfeeding. If tramadol is used, monitor infants for increased sleepiness (more than usual), difficulty breastfeeding, breathing difficulties or limpness, and contact a physician immediately if any of these occur.
◉ Effects in Breastfed Infants:Seventy-five breastfed infants whose mothers were breastfeeding and taking tramadol 100 mg every 6 hours following a cesarean section were compared to 75 matched infants at 2 to 4 days of age. Forty-nine percent of the mothers taking tramadol and all of the control mothers were taking other opiates (primarily oxycodone) and 61% of and 58%, respectively, also were taking a nonsteroidal antiinflammatory agent (primarily diclofenac). Examination by a pediatrician revealed no difference between the groups using the Neurologic and Adaptive Capacity Score.
An 8-month-old infant was brought to an emergency department (ED) in Egypt with altered mental status, hypoxia, hypotension and a low hematocrit. In the ICU, the infant had a positive urine drug screen for tramadol and a negative urine test for cannabinoids and opiates. Two doses of naloxone improved her blood gases and 2 days later her mental status had improved. The infant’s parents stated that they were addicted to tramadol and the mother was breastfeeding the infant. The infant was discharged on day 3 after admission. Thirty-six hours later, the infant again presented to the ED with cardiopulmonary arrest, with a 4 on the Glasgow coma scale and generalized clonic-tonic seizures. The infant died from cardiac arrest 3 days after admission. The mother stated that she had breastfed the infant after the initial discharge from the hospital. The author speculates that mother or infant might be an ultra-rapid CYP2D6 metabolizer leading to high levels of the active metabolite, because this variant is relatively prevalent in those of Mediterranean origin. However, neither genetic testing nor measurement of tramadol in milk or the infant were performed. This case cannot definitely be attributed to breastmilk exposure alone, because the sudden onset of the symptoms at 8-months of age seems implausible. It is somewhat more likely that the baby ingested the tramadol directly.
A hospital in Japan provided postpartum mothers with a combination tablet containing tramadol 37.5 mg and acetaminophen 325 mg every 6 hours for 3 days if they requested a pain medication. A retrospective analysis found that of 148 mothers who received the drug, all infants were breastfed and none of the infants had an adverse reaction, such as drowsiness, difficulty breastfeeding or breathing problems. The relatively low dose and short duration of therapy may have reduced the risk of adverse reactions.
A cross-sectional survey of mothers who had breastfed their infant in the past 12 months identified 142 mothers who had taken one or more medications while nursing. One of the mothers who was taking tramadol reported that her infant developed drowsiness, which caused her to change the time of feeding.
◉ Effects on Lactation and Breastmilk:Tramadol can increase serum prolactin. However, the prolactin level in a mother with established lactation may not affect her ability to breastfeed.
A randomized study compared tramadol and naproxen for post-cesarean section pain. Patients received the drugs either on a fixed schedule or as needed. No difference in breastfeeding rates were seen among the groups.
In a study in China, women with a scheduled cesarean section were randomized to receive intravenous patient-controlled analgesia with either sufentanil or tramadol. Postpartum prolactin levels were higher in the tramadol group (348 mcg/L) than in the sufentanil group (314 mcg/L). The onset of lactation was sooner in the tramadol group (21.4 hours) than in the sufentanil group (25.1 hours). Both of these difference were statistically significant. Injectable tramadol is not available in the United States.
A nonrandomized, nonblinded study in a Serbian hospital of women near term who underwent cesarean section compared general anesthesia (n = 284) to spinal or epidural anesthesia (n = 249). Spinal anesthesia consisted of hyperbaric bupivacaine 12 mg and fentanyl 0.01 mg; epidural anesthesia consisted of isobaric bupivacaine 0.5% (0.5 mg per 10 cm height) and fentanyl 0.05 mg. General anesthesia consisted of propofol 2.3 mg/kg and succinylcholine 1.5 mg/kg for induction and intubation, followed by an anesthetic gas mixture and oxygen. Reportedly, nitric oxide (possibly nitrous oxide) was 50% of the gas before delivery and 67% after delivery. Sevoflurane was also used in some cases. After delivery and cord clamping, mothers received fentanyl 3 mcg/kg and rocuronium 0.5 mg/kg intravenously for placental delivery. After surgery, neuromuscular block reversal was performed with neostigmine and atropine. All patients received 1 mg/kg of diclofenac every 8 h for 24 hours after delivery and 98% of general anesthesia patients also received 100 mg of tramadol and 78.5% received acetaminophen 1 gram. No regional anesthesia patients received tramadol or acetaminophen. Patients receiving one of the regional anesthetic protocols established lactation sooner (56% and 29% after 18 and 24 hours, respectively), while 86% of women receiving general anesthesia did not establish lactation until 36 to 48 hours after surgery.
A randomized, double-blind study was performed in pregnant women scheduled for cesarean section under spinal anesthesia with bupivacaine and fentanyl. Patients received either 100 mg diclofenac (n = 100), 100 mg tramadol (n = 100) or placebo (glycerin suppositories) n = 100, all given as rectal suppositories every 8 hours for the first 24 hours after surgery. The time to initiate breastfeeding was significantly shorter among mothers who received tramadol than a placebo, 1.7 vs 4.1 hours with breastfeeding support and 3.7 vs 6.2 hours without support. Diclofenac was slightly more effective than tramadol among mothers who received no support (3.5 vs 3.7 hours).
来源:Drugs and Lactation Database (LactMed)