颜兵:左甲状腺素(优甲乐、雷替斯等)的服药方式可以私人订制吗?

学术   2024-10-09 21:00   北京  

源于:首发2024-10-08 16:51·霍普甲状腺医生颜兵


国庆之暨,瑾将此长篇科普献给喜欢探究为什么的甲状腺患者!

告知甲状腺功能减退(简称甲减)患者怎么服用左甲状腺素(L-T4)是我每天工作的一部分。过去,在智能手机普及之前,似乎甲减患者较少关注L-T4的服用方式,也较少听见患者因此而抱怨。今天,十几种不同版本的服用方式被精准推送,一方面给患者带来了获取信息的便捷,同时也给患者带来了选择信息的迷茫。

不仅是标准版本的服药方式,其他推荐的服用方式也似乎成了甲减患者“生活之累”。

标准版本(优甲乐/雷替斯药品说明书)
1、清晨早餐前30分钟,空腹与足够的水或饮料一起服用全天剂量。

图01:两种左甲状腺素的药物成分一样,虽然辅料成分不同,但药效相同,个体吸收可能存在差异,建议更换药物6-8周后需要复查甲状腺功能,以确定更换后药量是否依然合适。
指南版本(美国甲状腺协会2014版《甲减治疗指南》)
2、清晨空腹服用,间隔1小时后早餐。
3、睡觉前服用(晚餐后间隔3小时或更长时间)。

图02:源自美国甲状腺杂志网站

京东药师版本:
4、餐前半小时服(没有标明早餐、中餐、晚餐)。应避免与黄豆制品、浓咖啡、葡萄柚同服。微量元素钙铁等应间隔4小时以上。

图03:源自京东药房短信提示。

其他版本:
5、清晨空腹服用(没有标注与早餐间隔时间)。
6、清晨六点空腹服用(没有标注与早餐间隔时间)。
7、清晨空腹服用,禁食鸡蛋、牛奶、豆浆等高蛋白食物。
8、凌晨四点服用,间隔4小时后早餐。
9、清晨六点服用,间隔2小时后早餐。
10、清晨服用后立即早餐。
11、晚餐前服用。
12、晚餐后间隔1-2小时服用。
13、每周服用一次。
14、……

虽然全世界约4亿甲减患者服用左甲状腺素,但关于影响L-T4吸收相关文献较少,且研究的样本量很小(很多文献的样本数仅为个位数)、缺乏重复性验证、有些仅是一些个案报道。一方面,相关研究结论不尽相同,甚至相悖;另一方面,不同的医生对研究结论有着不同的理解。故而,不同的医生可能给出不同的建议也就不足为奇。

图04:ClinCalc药物统计数据库,2022年美国超过1800万门诊甲减患者服用甲状腺激素替代补充药物——左甲状腺素,其门诊处方量位居第四位,仅次于阿伐他汀、二甲双胍、赖诺普利。按照美国甲减患者人口占比5.44%估算:中国甲减患者近8000万人,全世界约4亿人。

在此,通过溯源,解析不同服用方式对左甲状腺素吸收的影响,期望能帮助甲减患者选择最适合自己的私人订制服药方式。为了让患者更好的理解和明智的选择,需要先回答几个相关问题:

左甲状腺素最高吸收率的服用方式是什么?

影响L-T4吸收的因素:(服药前的)空腹时间、(服药后的)间隔时间、饮料食物、以及伴随疾病(胃肠道疾病等,以及伴随疾病药物)。由于不能穷尽所有饮料、食物和药物的研究,除外少量已知的,真实世界影响吸收的因素可能多到超出你的想象。

图05:改编自2012美国临床内分泌和甲状腺协会《成人甲减临床实践指南》。一些新发现的影响因素未纳入表中,如木瓜、喝茶、利福平、西甲硅油、洛匹那韦、卡马西平等。

依据现有的研究,空腹服用后间隔4小时后进食或服用其他药物才可能确保获得最高的左甲状腺素吸收率。为此,可选择的路只有两条:

“半夜鸡叫”服用方式——凌晨3点或4点服药,以确保4小时间隔后早餐不影响左甲状腺素的吸收。

“饥饿”服用方式——清晨空腹服药后不吃早餐,以避免4小时内因进食而影响左甲状腺素的吸收。

左甲状腺素最方便的服用方式是什么?

每周服药一次,一次服完一周药量。

虽然让人动心,但估计很少有患者付诸行动。其实,这种方式也是基于左甲状腺素的药代动力学和临床实践给出的科学建议:

半衰期有的药物每天服用3次,也有的药物每天服用1次,个别的药物甚至可以每周服用一次。不同药物服用频率和间隔时间主要取决于药物的半衰期(血液中药物浓度从峰值下降至一半所需要的时间)半衰期短,服药频率高,间隔时间短。相反,则服药频率低,间隔时间长。例如,糖尿病药物曲格列汀,由于其半衰期较长,因此可以每周服用一次。

药代动力学首先,经肠道吸收进入血液的左甲状腺素钠99.97%将与特定的转运蛋白结合,这将有利于维持和延长药物浓度(左甲状腺素的半衰期7天)。其次,左甲状腺素钠其实就是甲状腺功能检查中的T4(甲状腺素),T4是T3(三碘甲状腺原氨酸)的前体激素,只有当T4转化为具有生物活性的T3才能最大效能的发挥作用。T4向T3的转化受自身调节控制,我们的身体会根据自身的需要通过脱碘酶将T4转化为T3。低血清T4水平时转化率增加,而血清T4升高时转化率降低。因此,每周服用一次在理论上是可行的和安全的,不会因每周单次补充7倍高剂量导致药物性甲亢。

临床实践目前的临床研究表明每周服用一次是有效的、安全的。正因如此,美国甲状腺协会和巴西内分泌代谢协会推荐对于依从性差的患者因每天服用不方便,而不愿意坚持服药的患者)和需要监护的老年患者采用每周服用一次。

左甲状腺素最适合的服用方式是什么?

达到治疗目标,且不改变患者生活习惯、也不降低患者生活质量的服用方式——即个体最适合的服用方式,即方便,又易记,让患者重新获得享受与甲状腺功能正常人一样的生活。

显然,标准版本的服药方式(清晨空腹服药,间隔0.5-1小时后吃早餐)并非适合所有患者。如果选择其他方式,对治疗有多大的影响:

图06:改编自文献数据。

从以上数据可以看出,其实不同饮食和服药方式对左甲状腺素(L-T4)的吸收没有影响或影响较小,我们不必追求获得更高的吸收率,而应根据自身情况,选择和订制最适合自己的服药方式。如果L-T4的吸收受到一些影响,建议优先考虑通过适当增加一点药量,以抵消损耗——同样既可以实现治疗目标,又不被服药方式所束缚。

依据胃内处于酸性环境更有利于左甲状腺素片溶解吸收的理论,除外进食时胃酸被食物中和导致短暂PH值升高至6,其他时间胃内PH值维持在1.5到3.5之间的偏酸性环境,与清晨空腹时胃内酸度相当。因此,除外上述服药方式,理论上还可以选择午餐前1小时,午餐后2小时服药。

图07:源自
https:www.thoughtco.comph-of-the-stomach-608195

如何平衡左甲状腺素钠与其他药物的服用时间?

如遇甲减患者伴发疾病需要服用其他药物时,应当如何科学的安排服药时间?先让我们再了解一下不同药物对左甲状腺素的影响:

图08:改编自文献数据。

与不同服药方式和饮食对左甲状腺素的影响相似,感觉没有想象的大。且不同的研究,由于受研究方法的差异性、纳入研究人群的异质性的影响,导致结论不尽相同,甚至相互矛盾。因此,建议患者依然根据自身情况,选择和订制最适合自己的服药方式:

如果不存在不同药物服用时间冲突,建议不同时间分开服用。如果感觉不方便,也可以考虑一起服用,如果存在影响,可以通过增减L-T4剂量来调整。

如果存在不同药物服用时间冲突,优先考虑一起服用,如果存在影响,可以通过增减L-T4剂量来调整。如果仍无法达到治疗目标,则应考虑更换药物。

结束语

除外患者个体差异,就总体而言,各种影响因素对左甲状腺素吸收的影响较小。对于需要终生服药的甲减患者,选择最适合自己的服药方式实现消除甲减/或抑制甲状腺肿瘤的目标将是最优选,而非选择最高吸收率的服药方式,让自己获得与甲状腺功能正常人一样的生活品质。

温馨提示:如果明天你更改了服药方式,建议务必6-8周后复查一次甲状腺功能,以确认新服药方式下甲状腺激素水平是否达到治疗目标。

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