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Teratogenic drugs
1. 1. NURUL MIZA SHASHEIHA BINTI ABDUL MUTALIB
2. NURUL HUSNA BINTI MURYADI
3. WAN FATHIAH NASUHA BT WAN NUSDRI
4. NURFATIN AFIQAH BT MOHD BADRONDIN
5. ZATEEL FAHADA BT RUSLI
6. NURUL FIRDAUS BT HANAFEE
7. NURUL SAHIIRAH BT AHMAD ROFI
8. WAN FARAH NASUHA BT WAN MUHAMMAD HUSNI
2. INTRODUCTION
• WHAT IS TERATOGEN ?
• TERATOGENIC DRUG
• FDA PREGNANCY CATEGORIES
• GENERAL MECHANISMS OF ACTION OF
TERATOGENIC DRUGS
• TERATOGENIC MECHANISMS OF MEDICAL
DRUGS
3. TERATOGEN
• Is an agent that can
disturb the
development of the
embryo or fetus
• Teratogens halt the
pregnancy or
produce a
congenital
malformation
• Include radiation,
maternal infections,
chemicals, and
drugs.
• directly or indirectly,
causes a structural or
functional change in the
fetus or child if it is
administrated to pregnant
mother
• If mother is taking this
drug, It can be either
stopped, switched or
reduced to the lowest
dose possible
• typically during sensitive
periods of fetal
development
• depending on the
particular teratogenic
process and target organ
TERATOGENIC
DRUG
4. FDA PREGNANCY CATEGORIES
CATEGORY A
• failed to
demonstrat
e a risk to
the fetus in
the first
trimester of
pregnancy
• no evidence
of risk in
later
trimesters
CATEGORY C
• shown an
adverse effect
on the fetus
• no adequate
and well-
controlled
studies in
humans
• potential
benefits may
warrant the
use of drug
despite
potential risks.
CATEGORY D
• positive
evidence of
human fetal
risk based on
adverse
reaction data
• potential
benefits may
warrant use of
the drug in
pregnant
women
despite
potential risks
CATEGORY B
• failed to
demonstrate
a risk to the
fetus
• no adequate
and well-
controlled
studies in
pregnant
women.
CATEGORY X
• demonstrates
fetal
abnormalities
• positive
evidence of
human fetal
risk based on
adverse
reaction data
• the risks
involved in use
of the drug in
pregnant
women
CATEGORY N
• FDA has
not
classified
the drug.
5. POSSIBLE SITES OF
ACTION OF TERATOGEN
DIRECT
TOXIC
ACTION
• FETUS:
-Direct toxicity.
-Metabolites toxic.
-Indirectly toxic, e.g.
anti-metabolites, anti-
vitamin.
-Pharmacodynamic
actions, e.g. on
cardiovascular system.
-Endocrine balance
altered
• FAETOPLACENTAL
UNIT:
-Umbilical cord, e.g.
spasm.
-Amniotic fluid volume
change.
-Faetal or maternal
placental blood flow.
-Placental transfer of
• MOTHER:
-Nutritional changes,
e.g. vitamin or
mineral deficiencies.
-Biochemical
changes with
secondary effects on
the foetus, e.g.
hyperglycaemia.
-Endocrine balance
• FATHER:
-Sperm changes
INDIRECT
TOXIC
ACTION
• Cause malformation
-interfering with
faetal metabolism
• Drugs:
-folic acid
antagonists
-antiepileptic drugs
6. TERATOGENIC MECHANISMS OF
MEDICAL DRUGS
• Folate antagonism
• Neural crest cell disruption
• Endocrine disruption
• Oxidative stress
• Vascular disruption and specific
receptor
• Enzyme-mediated teratogenesis
22. SIDE EFFECTS
IF USED IN 2ND – 3RD TRIMESTER OF PREGNANCY
1- fetal hypotension
2- renal failure
3- oligohydromnios
4- death
3rd tri
23. 2) DIAZEPAM
Centrally acting spasmolytic drug
It facilitates action of GABA in CNS
It acts as GABA synapse and produce sedation at
doses required to reduce muscles tone
24. PHARMACOKINETICS
ABSORPTION:
- Delayed and decreased when administered with a
moderate fat meal
DISTRIBUTION
- Highly bound to plasma protein
- Cross blood brain barrier
- Cross placental barrier
- Found in milk
30. 1) TETRACYCLINE
Protein synthesis inhibitor
Inhibit the binding of aminoacyl-tRNA to the mRNA-
ribosomes complex
Aminoacyl-tRNA mRNA-ribosomes complex
by binding to the 30S ribosomal subunit in mRNA
translation complex
31. SIDE EFFECTS
IN PREGNANCY…..
dental discolouration in chilren
maternal hepatotoxicity with large parenteral doses
32. 2) ACE INHIBITORS
AS IN SECOND TRIMESTER
Ace inhibitors in 2nd trimester
33. 3) CHLORAMPHENICOL
Bacteriostatic drug that stop bacterial growth by
inhibiting protein synthesis
Prevent protein chain elongation by inhibiting
peptidyl transferase activity of bacterial chromosome
Intravenous chloramphenicol use has been associated
with Gray Baby syndrome
This occur in newborn infants because they liver
enzymes not yet fully developed
chloramphenicol remains
unmetabolised in body
34. ADVERSE EFFECTS
Hypotension
Cyanosis
The condition can be prevented by using the drug at
recommended doses & monitoring blood levels
Gray Baby Syndrome
35. 4) AMINOGLYCOSIDES
EG: GENTAMICIN, STREPTOMYCIN
Have several potential antibiotic mechanisms
They interfere with the proofreading process
increased rate of error in synthesis with
premature termination
Inhibition of ribosomal translocation
peptidyl tRNA moves from A-site to P-
site
Disrupt the integrity of the bacterial cell membrane
36. Aminoglycosides are in pregnancy category D
They may cause auditory or vestibular nerve damage
37. 5) SULFAMETHOXAZOLE,
TRIMETHOPRIM
Sulfonamide bacteriostatic antibiotic
Structural analogs and competitive antagonist of PABA
Inhibit normal bacterial utilisation of PABA for the
synthesis of folic acid
Used as a bacteriostatic antibiotic in prophylaxis and
treatment of urinary tract infections
38. Trimethoprim binds to dihydrofolate redustase and
inhibit reduction of DHF to THF
Sulfamethoxazole inhibit dihydrofolate synthetase
40. •BE CAREFUL IN TAKING DRUGS DURING
PREGNANCY
•ALL CLINICIANS INCLUDING PHARMACISTS ARE
RESPONSIBLE TO COUNSEL PATIENTS WITH
COMPLETE , ACCURATE AND CURRENT
INFORMATION ON THE RISKS AND BENEFITS OF
USING MEDICATIONS DURING PREGNANCY