Separating overlapped records

[joreoh]

I'm working on dispensed medication data. The variables in this data set are sold date, daily supply, daily dose, calculated medication end date, and cluster means the dispense was continuous without gap being >=15 days. If the last medication ending date was > 15 days apart from another opioids medication dispense date, the new cluster started. 

solddt	rxsup	dose	med_end_dt	cluster
09/10/2009	16	200	9/26/2009	1
10/02/2009	2	45	10/4/2009	1
10/06/2009	66	90.91	12/11/2009	1
10/12/2009	16	200	10/28/2009	1
10/21/2009	12	62.5	11/2/2009	1
11/03/2009	33	181.82	12/6/2009	1
11/12/2009	2	45	11/14/2009	1
11/12/2009	16	200	11/28/2009	1
12/04/2009	33	181.82	1/6/2010	1
12/14/2009	25	128	1/8/2010	1
12/17/2009	2	45	12/19/2009	1
01/15/2010	5	45	1/20/2010	2
02//18/2010	25	90	3/15/2010	3

I'd like to separate the overlapping records into new observations to get a data set that looks like

t0	dose	t1	New daily dose	Cluster
10-Sep-09	200	9/26/2009	200	1
2-Oct-09	45	10/4/2009	45	1
6-Oct-09	90.91	10/11/2009	90.91	1
12-Oct-09	200	10/20/2009	290.91	1
21-Oct-09	62.5	10/28/2009	353.41	1
10/29/2009		11/2/2009	153.41	1
3-Nov-09	181.82	11/11/2009	272.73	1
12-Nov-09	200	11/14/2009	335.91	1
11/15/2009	16	11/28/2009	290.91	1
11/29/2020		12/3/2009	272.73	1
4-Dec-09	181.82	12/6/2009	454.55	1
12/7/2009		12/11/2009	272.73	1
12/12/2009		12/13/2009	181.82	1
14-Dec-09	25	12/16/2009	309.82	1
17-Dec-09	45	12/19/2009	354.82	1
20-Dec-09		1/6/2010	309.82	1
1/7/2010		1/8/2010	128	1
15-Jan-10		1/20/2010	45	2
18-Feb-10		3/12/2010	90	3

I was able to identify overlapping records using the lag function, but am not sure how to proceed.

[PaigeMiller]

Please provide your input data as a SAS data step, and not as a screen capture. See here for instructions.

[joreoh]

data test;
	infile datalines delimiter = ',';
	input solddt: date9. rxsup  dose  med_end_dt: date9. cluster ;
	format solddt yymmdd10. med_end_dt yymmdd10.;
	datalines;
	10sep2009, 16, 200, 26sep2009, 1
	02oct2009, 2, 45, 04oct2009, 1
	06oct2009, 66, 90.91, 11dec2009, 1
	12oct2009, 16, 200, 28oct2009, 1
	21oct2009, 12, 62.5, 02nov2009, 1
	03nov2009, 33, 181.82, 06dec2009, 1
	12nov2009, 2, 45, 14nov2009, 1
	12nov2009, 16, 200, 28nov2009, 1
	04dec2009, 33, 181.82, 06jan2010, 1
	14dec2009, 25, 128, 08jan2010, 1
	17dec2009, 2, 45, 09dec2009, 1
	15jan2010, 5, 45, 20jan2010, 2
	18feb2010, 25, 90, 15mar2010, 3
	;
run;

The input data is provided above. Thank you.