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Hi Doctor,

Good day!

I was diagnosed with Hyperthyroidism 2 mths ago & on medication now.

Free T3: 4.25 pg/mL (1.71 - 4.20)
Free T4: 1.84 ng/dL (0.70 - 1.85)
TSH: <0.01 ulU/ml (0.35 - 5.50)

I am prescribed with TIMAZOL 5mgx3 a day.

Being in this condition, is it safe if I were to plan for a pregnancy & continue breastfeeding my 16 mths old baby? (mix feed)

Some GP told me it’s safe to get pregnant (might have some complication tho) but it’s not advisable to breastfeed. Another told me its safe to continue with both.

I would love to hear from the experts & I am kinda confused + worried.

Thank you!

Regards,

Jess

Asked by Jess - Posted 5 years, 5 months, 4 weeks, 1 Day, 4 hours, 21 minutes ago.

Dear Jess

A pregnancy should only be contemplated when the hyperthyroidism is well controlled and the dosage of the anti-thyroid medication should be on the lowest effective dose that will control the condition.

Pregnancy while on medication is possible but beware that the medication does cross the placental barrier and in higher doses can cause problems with the fetus. These problems are however not common if the condition is well managed and on the lowest effective dose.

Breast feeding is also possible although again, the medication does appear in the breast milk. The baby’s development needs to be monitored and the mother kept at the lowest effective dose.

Looking at the anti-thyroid medication options available, many clinicians would opt to put their pregnant or breast-feeding mothers on Propylthiouracil (PTU) because it is perceived to be safer but there is little evidence to support this notion. This practice appears to be more by convention and little else.

Thanks.

Dr. Eeson Sinthamoney
Consultant Obstetrician & Gynaecologist
Fertility Specialist

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Panel of Experts:

Dr. Eeson Sinthamoney
MD (Mal), MRCOG (Lon),
DFFP (UK),
Fellowship in Reproductive Medicine (UK/Singapore)
Consultant Obstetrician & Gynaecologist
Fertility Specialist

Dr. Pong Kwai Meng
MBBS(Mal), FRCP(Glasg),
FRCP(Edin),M.Med. (Paeds),
MRCP(UK), MRCPCH, FAMM
Consultant Paediatrician & Neonatologist
Speciality: Paediatrics and Neonatology

Dr. Hoe Tuck Sang
MBBS (Malaya), AM, M. Med (Paed)
MRCP (UK), FRCP (Glasgow)
Consultant Paediatrician
Specialty: Paediatrics

Dr. Khoo Phaik Choo
MBBS (MAL), LRCP (London), MRCS (UK), DCH (London), MRCP (UK)
Consultant Paediatrician
Specialty : Paediatrics

Dr Sanjay Woodhull
MBBS (Manipal). MRCP (UK). FCCP (US)
Consultant Paediatrician
Specialty: Paediatrics

Dr. Patrick Chia
MBBS (London) MRCOG (UK) FAFP (Mal)
Consultant Obstetrician & Gynaecologist
Specialty : Obstetrics & Gynaecology and fetal medicine

Ms. Jennifer Hor
United Kingdom trained Nurse and Midwife
Specialty : Early Parenting Skills and Parentcraft Education

Ms. Gina Yong
Breastfeeding Consultant, Holistic Wellness and Fitness Coach
Specialty : Breastfeeding Support

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