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Hair guideMy partner is pregnant — what about finasteride?

My partner is pregnant — what about finasteride?

✓ 医学的に検証✍️ HairBase編集部📅 最終更新: 2026年6月14日⏱ 1分で読了
💡 まず結論

The 1 mg Propecia-style label and the 5 mg Proscar-style label both treat pregnancy as a handling and exposure question. Crowdsourcing a milligram for your partner is not what those inserts are for.

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U.S. prescribing information for finasteride states that women who are or may become pregnant should not handle crushed or broken tablets because of the risk to a male fetus (abnormalities of the external genitalia in animal studies and the drug’s mechanism of blocking DHT). Intact film-coated tablets are the labelled handling story. The American Urological Association and dermatology societies discuss sexual and pregnancy counselling as a clinician conversation, not a Reddit taper. This page will not invent a semen-wait calculator and is not medical advice.

If a pregnancy is planned or confirmed, the person taking finasteride needs their prescriber — not a hair forum — to decide whether to stop, when, and whether another option (topical minoxidil on-label, procedures) belongs on the table. Do not split or crush tablets to “share a dose.” Do not apply crushed powder as a topical. Dutasteride has its own longer half-life and blood-donation rules; that is a different insert.

A partner who already handled a broken tablet should call the prescriber or a teratogen/poison resource rather than wait for a home test. This page does not name a “safe number of days.” Keep tablets in the original bottle, away from children. This is not medical advice.

妊娠に関する警告: フィナステリドとデュタステリドは、発育中の男児胎児に害を及ぼす可能性があります。妊娠中または妊娠の可能性がある場合は、服用したり扱ったりしないでください。
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📚 根拠・出典

出典: AGA review (CCID) ↗

よくある質問

Can my pregnant partner touch a whole tablet?

The labelled concern is crushed or broken tablets. Ask the pharmacist and prescriber for the product you actually have. Do not crush tablets at home.

Does semen transmit a dangerous dose?

The insert discusses exposure. The numerical risk is a clinician conversation, not a forum milligram. Do not invent a condom protocol from this page.

Should I stop the night we find out?

Call the prescriber. Stopping and restarting hair drugs has its own shedding timeline. This page is not a stop-start protocol.

Is topical finasteride safer in this situation?

Compounded topical finasteride is not a U.S. OTC switch with the same insert. Ask the prescriber. Do not assume zero systemic exposure.

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⚠️ 医師の診察を受けるべきとき — 自己治療しないで

  • 突然のまだら、または円形のはげ
  • 赤み・鱗屑・膿・痛み・かゆみ(瘢痕性脱毛の可能性 — 緊急に治療を)
  • 切れ毛、または急速な脱毛
  • 全身性の徴候を伴う脱毛(体重減少、倦怠感、月経の変化、ニキビ、毛の増加)
  • 新しい薬の直後の脱毛
  • 子どものあらゆる脱毛
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