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Table 7 Estimation of the date for placing the next order of asthma inhalers, revolving drug fund, Benin, 31 January 2013

From: Assessment of a revolving drug fund for essential asthma medicines in Benin

Medicines Number of inhaler in stock (a) Date begin (b) Medicines ordered during the period (c) Date end (d) Number of inhalers remaining (e) Consumption during the period (f = a + c-e) Number of months during the period (g) Average monthly consumption (h = f/g) Estimation of the number of months covered by inhalers in stock (i = f/h) Approximate date of placing next medicine order (i-8*) months since (d)
Beclometasone 1 600 15/09/2012 3 000 31/01/2013 3 390 1 210 4.6 263 12,9 26/06/2013
Salbutamol 2 130 15/09/2012 2 250 31/01/2013 3 250 1 130 4.6 246 13,2 06/07/2013
  1. *Ordering must be started as soon as the number of inhalers in stock is sufficient for only 8 months: 2 months for reserve stock and 6 months as turnaround time between ordering and arrival of inhalers.