Dr. Knoll's interview caught my interest and got me poking around the internet reading about deprenyl. Ultimately I decided to try it primarily for the potential life extension benefit and the welcomed nootropic effect. I am 23 which it seems a lot of people feel is too young to start taking it, however in rat studies, mice have treatment begun at the human equivilent age of 15 and experienced robust life extension.
Dosage is crucial for life extension:
Dr. Kitani and colleagues, who conducted the second control survival study with deprenyl, also used Fischer 344 rats. They obviously considered that these rats are shorter living than the Wistar-Logan rats, and they started to work with one and a half year old rats. This was an advantageous change in the experimental conditions and found a satisfyingly significant, thirty-four percent prolongation of the average life span.
However, in the hope to increase the effectiveness of their treatment they doubled the dose of deprenyl. Although a higher dose is usually more effective than a lower one, the doubling of the dose was in this special case an unfavorable change. We know now that 0.01 milligrams per kilogram of deprenyl is sufficient to exert an enhancer effect. Thus the 0.5 milligrams per kilogram dose was obviously enormously high, and this explains why Kitani and colleagues found no sign of the significant extension in the longest survival which appeared in our studies and in the Milgram et al. study.
I ordered liquid Selepryl which has about 380 drops in the bottle and each drop has 1mg of selegiline citrate. So the question that I have is do I take my dose sublingually or mix it in with water and ingest it. I have read else where that sublingual dosage would yield a 5x greater effect.
http://www.ncbi.nlm....pt=AbstractPlus
A new formulation of selegiline: improved bioavailability and selectivity for MAO-B inhibition.
Clarke A, Brewer F, Johnson ES, Mallard N, Hartig F, Taylor S, Corn TH.Scherer DDS, Swindon, United Kingdom. aclarke@cephalon.com
Seven randomised comparative studies were conducted in healthy volunteers to compare the pharmacokinetic and pharmacodynamic profiles of selegiline hydrochloride in a new formulation designed for buccal absorption "Zydis Selegiline" (1.25-10 mg) with conventional selegiline hydrochloride tablets "conventional selegiline tablets" (10 mg). A total of 156 healthy volunteers participated in these studies. Plasma concentrations of selegiline and its primary metabolites, N-desmethylselegiline (DMS), l-amphetamine (AMT), and l-methamphetamine (MET) were measured using Gas Chromatography Mass Spectrometry (GCMS) and gas liquid chromatography (GLC) assays. Inhibition of monoamine-oxidase type B (MAO-B) and monoamine oxidase type A (MAO-A) activity was determined by measurement of as beta-phenylethylamine (PEA) by GCMS and 5-hydroxyindoleacetic acid (5-HIAA) by High Performance Liquid Chromatography (HPLC) assays. Almost a third (2.96 mg) of a 10 mg selegiline dose in Zydis Selegiline was absorbed pre-gastrically (predominantly buccally) within 1 minute. Mean [SD] area-under-the curve (AUC(0- infinity)) values following Zydis Selegiline 10 mg (5.85 [7.31] ng.h/mL) were approximately five times higher than those following conventional selegiline tablets 10 mg (1.16 [1.05] ng.h/mL). In contrast, plasma concentrations of metabolites were significantly ( p<0.001) lower following Zydis Selegiline 10 mg than following conventional selegiline tablets 10 mg. Plasma concentrations of selegiline and its metabolites increased in a dose-dependent manner over the dose-range Zydis Selegiline 1.25-5 mg. Bioavailability was determined using AUC and peak plasma concentrations (C(max)). The C(max) of selegiline was similar following administration of Zydis Selegiline 1.25 mg (1.52 ng/mL) or conventional selegiline tablets 10 mg (1.14 mg/mL). The range of values for AUC(0- infinity) and C(max) following Zydis Selegiline 1.25 mg were entirely contained within the range following conventional selegiline tablets 10 mg, with a much higher variability of plasma selegiline concentrations occurring after conventional selegiline tablets than after Zydis Selegiline. As expected, peak plasma concentrations for DMS, AMT and MET were consistently lower after Zydis Selegiline 1.25 mg (1.19, 0.34, 0.93 ng/ml, respectively) than after conventional selegiline tablets 10 mg (18.37, 3.60, 12.92 ng/ml, respectively). A significant (r=0.0001) correlation between daily PEA excretion (a measure of brain MAO-B inhibition) and the log-transformed AUC((0-t)) for selegiline was demonstrated. Mean daily PEA excretion was similar following Zydis Selegiline 1.25 mg and conventional selegiline tablets 10 mg (13.0 microg versus 17.6 microg). In contrast, there was no correlation between PEA excretion and selegiline metabolites, indicating that selegiline metabolites do not significantly inhibit MAO-B. Urinary excretion of 5-HIAA (used as a marker for MAO-A inhibition) was unrelated to plasma concentrations of selegiline or DMS following single or repeat dosing of Zydis Selegiline 1.25 mg or conventional selegiline tablets 10 mg. However, comparison of treatment groups revealed a significantly lower excretion of 5-HIAA in the conventional selegiline tablets 10 mg group than in the Zydis Selegiline 1.25 mg group after repeated administration over 13 days. In summary, by reducing the opportunity for first-pass metabolism, the absorption of selegiline from Zydis Selegiline was more efficient and less variable than from conventional selegiline tablets. Compared with conventional selegiline tablets 10 mg, Zydis Selegiline 1.25 mg yielded similar plasma concentrations of selegiline and degree of MAO-B inhibition, but markedly reduced concentrations of the principal metabolites. Thus, the lower but equally MAO-B inhibitory dose of selegiline in Zydis Selegiline 1.25 mg, which is associated with lower concentrations of potentially harmful metabolites, could offer a safer and more predictable treatment in the management of patients with Parkinson's disease.
PMID: 14628189 [PubMed - indexed for MEDLINE]
Now the liquid Selepryl does not appear to be the same as the Zydis Selegine, but it does seem like it might be able to be absorbed sublingually. At anyrate, the package has no indication how the drops are to be taken. How do you guys take it?
