This is a hard read but I think I follow!
Do you know what sort of doses of propranolol raise allopregnanolone and by how much?
Propranolol, certain SSRI:s like Fluoxetine, Amitriptyline, Mirtazapine and many antipsychotic raises allopregnanolone.
Allopregnanolone (AP) is a neurosteroid synthesized in the brain and a positive allosteric modulator of γ-aminobutyric acid (GABA) type A receptors. Some drugs possessing the aryloxypropanamine (AOPA) pharmacophore, such as fluoxetine, exert their central nervous system (CNS) effects by...
pubmed.ncbi.nlm.nih.gov
"Some drugs possessing the aryloxypropanamine (AOPA) pharmacophore, such as fluoxetine, exert their central nervous system (CNS) effects by increasing the brain AP. Although duloxetine (DLX), dapoxetine (DPX), atomoxetine (ATX) and propranolol (PRL) also possess the AOPA pharmacophore and are used to treat some psychiatric disorders, the capabilities of these drugs to increase the brain AP and the possible involvement of AP in their CNS effects remain to be fully elucidated. To clarify these points, we first developed a method for quantifying AP in the rat brain by liquid chromatography/electrospray ionization-tandem mass spectrometry. Analysis of the changes in the brain AP levels using this method revealed that the intraperitoneal administration of DLX (10 mg/kg), DPX (10 mg/kg) and PRL (20 mg/kg) significantly increased the brain AP (DLX: < 0.40-2.74 ng/g tissue, DPX: 1.48-3.83 ng/g tissue and PRL: < 0.40-2.09 ng/g tissue) compared to the saline administration (<0.40 ng/g tissue). These results suggested the possible involvement of the GABAergic neurosteroid, AP, in the central actions of DLX, DPX and PRL. In contrast, ATX (10 mg/kg) did not affect the AP levels in the brain. In addition, the brain and serum AP levels had a remarkably high positive correlation after the administration of DLX, DPX and PRL."
"
Fluoxetine, paroxetine, and sertraline increase allopregnanolone production through increased efficiency of conversion of DHP to allopregnanolone. Fluoxetine also may have some effect through the inhibition of a competing pathway (progesterone to 20α-dihydroprogesterone)."
"Some antipsychotics, particularly olanzapine and clozapine, can increase allopregnanolone levels, which may contribute to their antipsychotic effects by modulating
GABAergic neurotransmission. This effect is not seen with all antipsychotics, as risperidone and haloperidol do not appear to significantly alter allopregnanolone levels. The increase in allopregnanolone may also explain the anxiolytic-like effects of olanzapine and clozapine."
The raise of allopregnanolone was about 107% with Propranolol if I remember correctly according to some study that I didn't find right now. But if you take the precursor pregnenolone 200-1000mg with propranolol 40mg, amitriptyline 25-50mg and olanzapine 2,5mg-5mg the raise in allopregnanolone will be quite high at least when I tested that combo the gabaergic effect was stronger than 2mg of Alprazolam if I noticed correctly.
"Amitriptyline increases allopregnanolone levels by stimulating the activity of the
3α3 alpha
-HSD enzyme, which is involved in the synthesis of this neurosteroid. This effect has been observed in preclinical studies, and a reduction in allopregnanolone levels is associated with depression and other psychiatric disorders. Amitriptyline’s ability to boost allopregnanolone production is a suggested mechanism for its antidepressant and anxiolytic effects. "
"
Clinical relevance: Reduced levels of allopregnanolone are found in patients with depression and anxiety disorders. The increase in allopregnanolone levels caused by antidepressants like amitriptyline may contribute to the improvement of these symptoms.
Other drugs: Other antidepressants, such as selective serotonin reuptake inhibitors (SSRIs) and other tricyclic antidepressants, have also been shown to have a similar effect on allopregnanolone synthesis."